SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
INDOOR UNIT
No. OBH488
SERVICE MANUAL
Wireless type
Models
E1
MSZ-FD25VA -
E1
MSZ-FD25VAS -
E1
MSZ-FD35VA -
E1
MSZ-FD35VAS -
Outdoor unit service manual
MUZ-FD·VA Series(OBH489)
MXZ-A·VA Series (OB377)
MXZ-8A140A (OC316)
CONTENTS
1. TECHNICAL CHANGES ····································3
2. PART NAMES AND FUNCTIONS······················4
3. SPECIFICATION·················································5
4. NOISE CRITERIA CURVES·······························6
5. OUTLINES AND DIMENSIONS ·························7
6. WIRING DIAGRAM ············································7
7. REFRIGERANT SYSTEM DIAGRAM················8
8. SERVICE FUNCTIONS ······································9
9. MICROPROCESSOR CONTROL ····················11
10. TROUBLESHOOTING······································20
11. DISASSEMBLY INSTRUCTIONS·····················36
PARTS CATALOG (OBB488)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
1
TECHNICAL CHANGES
E1
E1
E1
E1
MSZ-FD25VA -
MSZ-FD35VA -
MSZ-FD25VAS -
MSZ-FD35VAS -
1. New model
3
2
PART NAMES AND FUNCTIONS
MSZ-FD25VA
MSZ-FD25VAS
MSZ-FD35VA
MSZ-FD35VAS
POWER lamp
AREA lamp
CLEAN lamp
PLASMA lamp
Remote control
receiving section
Operation Indicator
lamp
Front panel
Air filter
Air inlet
Remote controller
Plasma anti-allergy
enzyme filter
Plasma electrode
unit
Plasma deodorizing
filter
i-see sensor
Air outlet
Fan guard
Fan
Horizontal vane
Heat exchanger
Emergency operation
switch
Vertical vane
i-see control operation
AREA lamp indicate AREA setting
In AREA setting, the horizontal air flow
direction changes automatically according
to the detection of i-see Sensor which detects
the floor/ wall temperature to air-condition
the room evenly.
i-see sensor constantly measure
floor/wall temperature to automatically
adjust to the set temperature by
estimating the temperature
actually perceived by a
person inside the room
("sensible temperature").
ACCESSORIES
Installation plate
Installation plate fixing screw 4 o 25 mm
1
2
3
4
5
6
7
1
5
1
2
2
1
1
Remote controller holder
Fixing screw for 3 3.5 o 1.6 mm (Black)
Battery (AAA) for remote controller
Wireless remote controller
Felt tape (Used for left or left-rear piping)
4
3
SPECIFICATION
Indoor model
Power supply
MSZ-FD25VA
MSZ-FD25VAS
MSZ-FD35VA
MSZ-FD35VAS
Single phase
230 V, 50 Hz
Power input ✽1 Cooling
26
28
W
Heating
31
33
Running current ✽1 Cooling
0.25
0.30
0.25
0.30
0.27
0.32
0.27
0.32
A
Heating
Fan motor current ✽1 Cooling
A
Heating
Fan motor model
RCOJ40-GF
798O295O257
12
Dimensions WOHOD
Weight
mm
kg
Color
PURE WHITE
SILVER
PURE WHITE
SILVER
Air direction
4
Air flow
Cooling
Heating
Cooling
Heating
Cooling
Heating
Cooling
Heating
Cooling
Heating
Cooling
Heating
672
K/h
K/h
dB(A)
dB(A)
rpm
(Super High)
Air flow
726
750
516/378/276
(High/Med./Low)
Sound level
(Super High)
Sound level
(High/Med./Low)
Fan speed
552/402/270
42
552/402/282
43
36/29/20
36/29/21
1,190
(Super High)
Fan speed
1,270
1,300
950/740/580
rpm
(High/Med./Low)
1,010/780/570
1,010/780/590
Fan speed regulator
4
KM08A
Remote controller model
NOTE : Test conditions are based on ISO 5151
Cooling : Indoor Dry-bulb temperature 27 :
Outdoor Dry-bulb temperature 35 :
Wet-bulb temperature 19 :
Heating : Indoor Dry-bulb temperature 20 :
Outdoor Dry-bulb temperature 7 :
Wet-bulb temperature 6 :
Refrigerant piping length (one way): 5 m
✽1 Measured under rated operating frequency.
Specifications and rating conditions of main electric parts
Fuse
250 V 3.15 A
(F11)
(MT)
i-see Sensor motor
Horizontal vane motor
Vertical vane motor
Varistor
MP20Z 12 VDC 300 "(at 25 ˚C)
(MV1)
(MV2)
(NR11)
(RR)
MSFBC20C29 12 VDC 350 "(at 25 ˚C)
MSBPC20M11 12 VDC 300 "(at 25 ˚C)
S10K320E3K1
i-see Sensor
A2TPMI 23A FOV50 OBA060 P8L1 J4S
3P
Terminal block
(TB)
5
4
NOISE CRITERIA CURVES
MSZ-FD25VA
MSZ-FD25VAS
MSZ-FD35VA
MSZ-FD35VAS
FAN SPEED FUNCTION SPL(dB(A))
LINE
FAN SPEED FUNCTION SPL(dB(A))
LINE
COOLING
HEATING
COOLING
HEATING
Super High
Super High
42
43
43
43
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
NC-70
NC-70
NC-60
NC-50
NC-40
NC-30
NC-60
NC-50
NC-40
NC-30
NC-20
NC-20
NC-10
NC-10
63
125
250
500
1000 2000 4000 8000
63
125
250
500
1000 2000 4000 8000
BAND CENTER FREQUENCIES, Hz
BAND CENTER FREQUENCIES, Hz
Test conditions
Cooling : Dry-bulb temperature 27 : Wet-bulb temperature 19 :
Heating : Dry-bulb temperature 20 :
INDOOR UNIT
WALL
1 m
0.8 m
MICROPHONE
6
5
OUTLINES AND DIMENSIONS
Unit : mm
MSZ-FD25VA
MSZ-FD25VAS
MSZ-FD35VA
MSZ-FD35VAS
11
X
20 Oblong hole
11
X
26 Oblong hole
225
225
64
64
Installation plate
798
785
6.5
155
155
Indoor unit
345
330
69
Wall hole
54
[
65
Air in
Installation plate
Piping
257
5
43
55
688
55
Drain hose
43
85
97
58
19
Air out
Insulation
Liquid line
Gas line
[35 O.D
[6.35 - 0.5 m (Flared connection [6.35)
[9.52 - 0.43 m (Flared connection [9.52)
Insulation [28 O.D Connected part [16 O.D
Drain hose
6
WIRING DIAGRAM
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS
7
7
REFRIGERANT SYSTEM DIAGRAM
MSZ-FD25VA
MSZ-FD25VAS
MSZ-FD35VA
MSZ-FD35VAS
Unit : mm
Refrigerant pipe [9.52
(with heat insulator)
Indoor coil
thermistor
RT12 (main)
Indoor
heat
exchanger
Flared connection
Indoor coil
thermistor
RT13 (sub)
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe [6.35
(with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating
8
8
SERVICE FUNCTIONS
MSZ-FD25VA
MSZ-FD25VAS
MSZ-FD35VA
MSZ-FD35VAS
8-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board.
The time will be shortened as follows. (Refer to 10-7.)
Set time : 1-minute ➔➔1-second
Set time : 3-minute ➔➔3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is
shortened by short circuit of JPG and JPS.)
8-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION
A maximum of 4 indoor units with wireless remote controllers can be used in a room.
In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be
modified according to the number of the indoor unit.
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below :
NOTE : For modification, take out
the batteries and press the
OPERATE/STOP(ON/OFF)
button twice or 3 times at
first.
After modification, put back
the batteries then press
the RESET button.
J1
J2
The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1.
After modification, press the RESET button.
Table 1
4 units operation
Same as at left
1 unit operation
2 units operation
3 units operation
Same as at left
Same as at left
Solder J2
No. 1 unit
No. 2 unit
No. 3 unit
No. 4 unit
No modification
Same as at left
Same as at left
–
–
–
Solder J1
Same as at left
–
–
Solder both J1 and J2
–
How to set the remote controller exclusively for particular indoor unit
After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote
controller for the indoor unit.
The indoor unit only accept the signal from the remote controller that has been assigned to the indoor unit once they are set.
The setting will be cancelled if the breaker is turned OFF, or the power supply is shut down.
Please conduct the above setting once again after the power has restored.
9
8-3. AUTO RESTART FUNCTION
When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed
are memorized by the indoor electronic control P.C. board. “AUTO RESTART FUNCTION” automatically starts operation
in the same mode just before the shutoff of the main power.
Operation
1 If the main power has been cut, the operation settings remain.
2 After the power is restored, the unit restarts automatically according to the memory.
(However, it takes at least 3 minutes for the compressor to start running.)
How to release “AUTO RESTART FUNCTION”
1Turn OFF the main power for the unit.
2Solder the Jumper wire to JR07 on the indoor electronic control
P.C. board. (Refer to 10-7.)
JR07
NOTE :
• The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote
controller.
• If main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is can-
celled.
• If the unit has been OFF with the remote controller before power failure, the auto restart function does not work as the
power button of the remote controller is OFF.
• To prevent breaker OFF due to the rush of starting current, systematize other home appliance not to turn ON at the
same time.
• When some air conditioners are connected to the same supply system, if they are operated before power failure, the
starting current of all the compressors may flow simultaneously at restart.
Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current
by adding to the system that allows the units to start one by one.
8-4. REMOTE CONTROLLER
Be sure to set the slide switch inside the remote controller to an appropriate position in accordance with the installed
position of the indoor unit. If the switch is not set correctly, the air conditioner may not function properly.
Slide swich
Area
Left
Center
Right
Position of
the slide
switch
Display on
the remote
controller
Where is the indoor unit installed in your room?
Installed at left, if the
distance is not more
than 50 cm.
Installed at right, if the
distance is not more
than 50 cm.
(Left)
(Center)
(Right)
Is the indoor unit in-
stalled at right, left or
center?
NOTE:If the indoor unit is installed more than 50 cm away from the side walls, cabinets or other nearby objects, set the slide
switch to the “center” position.
10
9
MICROPROCESSOR CONTROL
MSZ-FD25VA
MSZ-FD25VAS
MSZ-FD35VA
MSZ-FD35VAS
WIRELESS REMOTE CONTROLLER
Signal transmitting section
Operation display section
VANE CONTROL button
OFF TIMER button
ON TIMER button
OPERATE/STOP
(ON/OFF) button
FAN SPEED CONTROL button
OPERATION SELECT button
ECONO COOL button
TIME SET buttons
FORWARD button
BACKWARD button
PLASMA button
CLEAN button
i-see button
Temperature buttons
WIDE VANE button
(Vertical vane button)
AREA button
RESET button
CLOCK SET button
Indication of
remote controller
model is on back
NOTE: Last setting will be stored after the unit is turned OFF with the remote controller. Indoor unit receives the signal of the
remote controller with beeps.
INDOOR UNIT LAMP
The lamps at the center of the indoor unit indicates the operation state.
Lamp
AREA
Operation state
Refer to 9-7.
Lamp lights during operation.
Lamp blinks in abnormal condition.
POWER
CLEAN
Lamp lights during clean operation.
Refer to 9-9.
Lamp lights during PLASMA operation.
Refer to 9-8.
PLASMA
11
9-1. COOL (
) OPERATION
(1) Press OPERATE/STOP(ON/OFF) button.
POWER lamp of the indoor unit turns on with a beep tone.
(2) Select COOL mode with OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 16 ~ 31 °C.
1. Coil frost prevention
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil
from frosting.
When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works.
The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor
heat exchanger rises.
2. Low outside temperature operation
When the outside temperature is lower, low outside temperature operation starts, and the outdoor fan slows or stops.
9-2. DRY (
) OPERATION
(1) Press OPERATE/STOP(ON/OFF) button.
POWER lamp of the indoor unit turns on with a beep tone.
(2) Select DRY mode with OPERATION SELECT button.
(3) The set temperature is determined from the initial room temperature.
1. Coil frost prevention
Coil frost prevention is as same as COOL mode. (9-1.1.)
2. Low outside temperature operation
Low outside temperature operation is as same as COOL mode. (9-1.2.)
9-3. HEAT (
) OPERATION
(1) Press OPERATE/STOP(ON/OFF) button.
POWER lamp of the indoor unit turns on with a beep tone.
(2) Select HEAT mode with OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 16 ~ 31 °C.
1. Cold air prevention control
When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room tem-
perature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.
2. High pressure protection
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the con-
densing pressure from increasing excessively.
When the temperature of indoor heat exchanger becomes too high, the high pressure protection works.
The indoor fan operates following the cold air prevention control. This mode continues until the temperature of indoor
heat exchanger falls.
3. Defrosting
Defrosting starts when the temperature of outdoor heat exchanger becomes too low.
The compressor stops once, the indoor/outdoor fans stop, the 4-way valve reverses, and the compressor re-starts.
This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes.
9-4. AUTO CHANGE OVER ··· AUTO MODE OPERATION
Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation.
Mode selection
(1) Initial mode
When unit starts the operation with AUTO operation from off;
• If the room temperature is higher than the set temperature, operation starts in COOL mode.
• If the room temperature is equal to or lower than the set temperature, operation starts in HEAT mode.
(2) Mode change
COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 2 °C below the
set temperature.
HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 2 °C above the
set temperature.
NOTE 1
If two or more indoor units are operating in multi system, there might be a case that the indoor unit, which is operating
in
(AUTO), cannot change over to the other operating mode (COOL
HEAT) and becomes a state of standby.
Refer to NOTE 2 “FOR MULTI SYSTEM AIR CONDITIONER”.
12
NOTE 2
FOR MULTI SYSTEM AIR CONDITIONER
OUTDOOR UNIT : MXZ series
Multi system air conditioner can connect two or more indoor units with one outdoor unit.
•When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and
the others for heating, the operation mode of the indoor unit that operates earlier is selected. The other indoor
units cannot operate, indicating as shown in the figure below. In this case, please set all the indoor units to the
same operation mode.
Lighted
L AREA R
POWER CLEAN PLASMA
Blinking
Not lighted
•When indoor unit starts the operation while the defrosting of outdoor unit is being done, it takes a few
minutes(max. 10 minutes) to blow out the warm air.
•In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant flow-
ing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.
9-5. AUTO VANE OPERATION
1. Horizontal vane
(1) Vane motor drive
These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of
the motor are controlled by pulse signals (approx. 12 V) transmitted from indoor microprocessor.
(2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.
(3) Positioning
To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the selected
angle.
Confirming of standard position is performed in the following cases:
(a) The operation starts or finishes (including timer operation).
(b) The test run operation starts.
(c) Standby mode (only during multi system operation) starts or finishes.
(4) VANE AUTO (
) mode
The microprocessor automatically determines the vane angle to make the optimum room temperature distribution.
HEAT operation
COOL and DRY operation
Vane angle is fixed to Angle 4.
Vane angle is fixed to Angle 1.
1
(5) STOP (operation OFF) and ON TIMER standby
In the following cases, the horizontal vane returns to the closed position.
(a) When OPERATE/STOP (ON/OFF) button is pressed (POWER OFF).
(b) When the operation is stopped by the emergency operation.
(c) When ON TIMER is ON standby.
(6) Dew prevention
During COOL or DRY operation with the vane angle at Angle 3 ~ 5 when the compressor cumulative operation time
exceeds 1 hour or 30 minutes, the vane angle automatically changes to Angle 2 for dew prevention.
13
(7) SWING ( ) mode
By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically.
(8) Cold air prevention in HEAT operation
The horizontal vane position is set to Upward.
NOTE : When 2 or more indoor units are operated with multi outdoor unit, even if any indoor unit turns thermostat
off, this control doesn’t work in the indoor unit.
(9) To change the airflow direction not to blow directly onto your body.
To change the air
flow direction
When to use this function?
COOL/DRY
HEAT
Use this function if you don’t
want the air from the indoor
unit to blow directly onto your
body.
Pressing and holding
VANE CONTROL
button for 2 seconds
or more cause
the horizontal vane
to reverse and
The air conditioner starts the
cooling or drying operation
approx. 3 minutes after the
vane has moved to the hori-
zontal position.
The air conditioner starts heat-
ing operation approx. 3 minutes
after the vane has moved to the
horizontal position.
•
Depending on the shape of
the room, the air may blow
directly onto your body.
•
Sometimes the area
around your feet may not
warm. To warm the area
around the feet, set the
horizontal vane to
•
When VANE CONTROL
button is pressed again,
the vane returns to the
previously-set position
and the air conditioner
starts the cool or dry
operation in approx.
3 minutes.
move to horizontal
position.
•
Press VANE CONTROL
button again to return the
vane to the previously-set
position.
(AUTO) or the downward-
blowing position.
•
When VANE CONTROL
button is pressed again,
the vane returns to the
previously-set position
and the air conditioner
starts the heat operation
in approx. 3 minutes.
Horizontal
position
NOTE :
• If you make the airflow not to blow directly onto your body by pressing VANE CONTROL button,
the compressor stops for 3 minutes even during the operation of the air conditioner.
• The air conditioner operates with Very Low speed until the compressor turns on again.
(10) ECONO COOL (
) operation (ECONOmical operation)
When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2 °C higher.
Also the horizontal vane swings in various cycle.
SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher, the air
conditioner can keep comfort. As a result, energy can be saved.
ECONO COOL operation is cancelled when ECONO COOL button is pressed once again or VANE CONTROL
button is pressed or changed to other operation mode.
2. Vertical vane
(1) Vane motor drive
These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of
the motor are controlled by pulse signals (approx. 12 V) transmitted from microprocessor.
(2) The vertical vane angle and mode change as follows by pressing WIDE VANE button.
1
4
5
2
3
(SWING)
(3) Positioning
To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the
selected angle.
Confirming of standard position is performed in the following cases:
(a) OPERATE/STOP(ON/OFF) button is pressed (POWER ON or OFF).
(b) SWING is started.
(c) The power supply turns ON.
(4) SWING( ) MODE
By selecting SWING mode with WIDE VANE button, the vertical vane swings horizontally. The remote controller dis-
plays “ ”. Swing mode is cancelled when WIDE MODE button is pressed once again.
14
9-6. i-see CONTROL OPERATION
The sensors constantly measure the room and floor/wall temperatures to automatically adjust to the set temperature by esti-
mating the temperature actually perceived by a person inside the room (“sensory temperature”).
Advantages
· The air inside the room is conditioned quickly to a comfortable condition.
· The room will not become too cold or hot even when the air conditioner is kept on for a long period.
· The air conditioner will not overcool or overheat, which means you can save on electricity.
i-see control operation is activated when i-see button is pressed with a thin stick in manual COOL or manual HEAT mode.
NOTE : i-see control operation is activated when the remote controller is first used following replacement of the batter-
ies or resetting of the remote controller.
i-see control operation is cancelled when i-see button is pressed with a thin stick once again.
NOTE : If the conditioner is turned OFF without cancelling i-see control operation, i-see control operation is activated
the next time the air conditioner is turned ON.
i-see Sensor
i-see Sensor, which is installed on the upper of the air outlet of the indoor unit, is moved with the stepping motor and it
detects the floor/ wall temperature.
Enlarged view of i-see Sensor
i-see Sensor is installed here.
i-see Sensor
· When AREA setting is not activated, the sensing range of i-see Sensor differs depending on the installation location of
the air conditioner.
Installation
position
Installed at left
Installed at center
Installed at right
Image of sensing
range
Direction of sensor
Right
Center
Left
Refer to "Remote controller in SERVICE FUNCTIONS".
· Install the front panel correctly after being removed for maintenance or service so that the floor/wall temperatures can
be measured correctly.
9-7. AREA (
) SETTING
(1) Press OPERATE / STOP (ON/ OFF) button to start the air conditioner.
(2) Press i-see button. (NOTE1)
(3) Press AREA button.
Each time the button is pressed, the area is changed in sequence:
(AUTO)
(LEFT)
(RIGHT)
Cancel
i-see Sensor moves intermittently, measuring the floor and wall temperature.
(4) AREA setting is cancelled when the "cancel" is selected by pressing AREA button, or when WIDE VANE button is pressed.
NOTE1: AREA setting is only available during i-see control operation.
NOTE2: If AREA setting is canceled, the vertical vane returns to the previously set position before AREA setting.
NOTE3: The horizontal air flow direction (WIDE VANE button), including horizontal SWING, cannot be set during AREA setting.
15
➔Indoor unit installation location and air-conditioning area
Installed at left
Installed at center
Installed at right
LEFT
RIGHT
LEFT
RIGHT
LEFT
RIGHT
Be sure to set the slide switch inside the remote controller to an appropriate position in accordance with the installed
position of the indoor unit. If the switch is not set correctly, the air conditioner may not function properly.
(Refer to "Remote controller in SERVICE FUNCTIONS".)
·
To air-condition mainly
To air-condition the entire room
To air-condition mainly
the left area of the room The horizontal air flow direction and in- the right area of the room
door unit display are switched accord-
ing to the room temperature (floor/wall).
Press AREA button
to select RIGHT.
Press AREA button
to select LEFT.
Remote controller button
Remote controller display
Press AREA button to select AUTO.
i-see Sensor operation
Control range
of horizontal air
flow direction.
The vertical air
flow direction
conforms to the
setting on the
remote controller.
(The horizontal
air flow direction
is controlled in
this range.)
Installed
at center
Installed
at left
Installed
at right
Lighted
Not lighted
L
R
L
R
L
R
L
R
Indoor unit
display
L
R
or
or
AREA
➔When AREA is set to AUTO
•The vertical vane is controlled to maintain uniform temperature in the whole room.
•The i-see Sensor moves in a range of 150 degrees detecting floor/wall temperature of 3 areas
(left, right, center). Therefore, the detected temperatures may be different from the temperatures
measured on commercial thermometers depending on the condition or temperature
distribution on the floor and/or wall.
Approx. 150 degrees
Ex.) In COOL mode
Daytime
Nighttime
Warm area
Cold area
The indoor unit delivers cold air detecting the warm area in the room.
Indication of AREA setting
AREA
L
R
L
AREA
R
Lighted
Not lighted
· The horizontal air flow direction changes if i-see Sensor detects approx. 3 : temperature difference.
·
In AUTO of AREA setting, both right and left lamps are lighted when the room is evenly air-conditioned.
L
AREA
R
16
Operation and operating range
i-see sensor moves 30 degrees from the center in both right and left side.
i-see Sensor turning to the right
i-see Sensor turning to the left
i-see Sensor turning to the center
i-see Sensor operates as follows in accordance with AREA setting made with the remote controller.
“AUTO” in AREA setting; first turning to the LEFT for adjusting the position then.....
CENTER
(The sensor turns to the right, left and center.)
“RIGHT” in AREA setting; first turning to the LEFT for adjusting the position then....
CENTER RIGHT CENTER RIGHT
(The sensor turns to the right and center.)
“LEFT” in AREA setting; first turning to the LEFT for adjusting the position then....
CENTER LEFT CENTER LEFT
(The sensor turns to the left and center.)
The sensor finishes turning to one area to another for 3 seconds and it operates one area for 5 seconds.
RIGHT
CENTER
LEFT
CENTER......
CENTER......
CENTER......
9-8. PLASMA (
) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button to start the air conditioner.
(2) Press PLASMA button to set PLASMA operation.
PLASMA lamp turns ON and plasma electrode unit is energyzed.
(3) Press PLASMA button again to cancel PLASMA operation.
Description of PLASMA operation:
Plasma operation consists of deodorizing and air purifying features.
Particles of odor-releasing substances are absorbed and decomposed by the plasma deodorizing filter.
Particles of allergens such as pollens and house dust are collected by the plasma anti-allergy filter.
These filters work with negative ions generated by the plasma electrode unit.
17
9-9. CLEAN (
) OPERATION
• When CLEAN operation is set, it performs for 40 minutes when unit is stopped after COOL/DRY operation. CLEAN
operation performs when: COOL is operated more than 3 minutes / DRY is operated more than 6 minutes.
• The horizontal vane is slightly opened and the fan is stopped for the first 15 minutes. then, the horizontal vane is set to
higher than angle 1 and the fan is operaed for 25 minutes.
9-10. TIMER OPERATION
1. How to set the time
(1) Check that the current time is set correctly.
NOTE : Timer operation will not work without setting the current time. Initially “0:00” blinks at the current time display of
TIME MONITOR, so set the current time correctly with CLOCK SET button.
How to set the current time
(a) Press the CLOCK set button.
(b) Press the TIME SET buttons (
and
) to set the current time.
• Each time FORWARD button (
) is pressed, the set time increases by 1minute, and each time BACK
WARD button (
) is pressed, the set time decreases by 1minute.
• Pressing those buttons longer, the set time increases / decreases by 10 minutes.
(c) Press the CLOCK set button.
(2) Press OPERATE/STOP (ON/OFF) button to start the air conditioner.
(3) Set the time of timer.
ON timer setting
START
(a) Press ON TIMER button(
) during operation.
(b) Set the time of the timer using TIME SET buttons (
and
) . w
OFF timer setting
STOP
(a) Press OFF TIMER button (
) during operation.
(b) Set the time of the timer using TIME SET buttons (
and
). w
w Each time FORWARD button (
) is pressed, the set time increases by 10 minutes; each time BACKWARD but-
ton (
) is pressed, the set time decreases by 10 minutes.
2. To release the timer
START
To release ON timer, press ON TIMER button (
To release OFF timer, press OFF TIMER button(
).
STOP
).
TIMER is cancelled and the display of set time disappears.
PROGRAM TIMER
• OFF timer and ON timer can be used in combination. The timer of the set time that is reached first will operate first.
• “ ” and “ ” display shows the order of OFF timer and ON timer operation.
(Example 1) The current time is 8:00 PM.
The unit turns off at 11:00 PM, and on at 6:00 AM.
(Example 2) The current time is 11:00 AM.
The unit turns on at 5:00 PM, and off at 9:00 PM.
NOTE : If the main power is turned OFF or a power failure occurs while ON/OFF timer is active, the timer setting is can-
celled. As these models are equipped with an auto restart function, the air conditioner starts operating with timer
cancelled when power is restored.
18
9-11. EMERGENCY/TEST OPERATION
In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the right side of the
indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of the
remote controller run down. The unit will start and AREA lamp will light.
The first 30 minutes of operation is the test run operation. This operation is for servicing. The indoor fan runs at High
speed and thermostat is ON, but temperature control does not work.
After 30 minutes of test run operation, the system shifts to EMERGENCY COOL / HEAT MODE with a set temperature of
24 °C. The fan speed shifts to Med.
All protective operations such as the coil frost prevention works even in emergency operation.
In the test run or emergency operation, the horizontal vane operates in VANE AUTO (
) mode.
Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any
signal from the remote controller. In case of latter, normal operation will start.
NOTE : Do not press EMERGENCY OPERATION switch during normal operation.
EMERGENCY OPERATION switch (E.O.SW)
Operation mode
Set temperature
Fan speed
COOL
HEAT
24 :
Med.
24 :
Med.
Horizontal vane
Vertical vane
Auto
Auto
Straight
Straight
The operation mode is indicated by the AREA
lamp as following
AREA lamp
L
AREA
R
EMERGENCY
COOL
Lighted
Not lighted
EMERGENCY
HEAT
STOP
NOTE:
This is the indication of EMERGENCY OPERATION
mode. AREA setting is not available during EMER-
GENCY OPERATION.
9-12. 3-MINUTE TIME DELAY OPERATION
When the system turns OFF, compressor will not restart for 3 minutes as 3-minute time delay function operates to protect
compressor from overload.
19
10
TROUBLESHOOTING
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS
10-1. CAUTIONS ON TROUBLESHOOTING
1. Before troubleshooting, check the following
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for miswiring.
2. Take care of the following during servicing
1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and then after
confirming the horizontal vane is closed, turn OFF the breaker and / or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the P.C. board.
3) When removing the P.C. board, hold the edge of the board with care NOT to apply stress on the components.
4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
Lead wiring
Housing point
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.
To make sure, check how many times the abnormality indication is flashing on and off before starting service work.
2) Before servicing, check that the connector and terminal are connected properly.
3) When the P.C. board seems to be defective, check the copper foil pattern for disconnection and the components for
bursting and discoloration.
4) When troubleshooting, refer to 10-2., 10-3. and 10-4.
4. How to replace batteries
Weak batteries may cause the remote controller malfunction.
In this case, replace the batteries to operate the remote controller normally.
1 Remove the front lid and insert batteries.
2 Press RESET button with tip end of ball point pen
Then reattach the front lid.
or the like, and then use the remote controller.
Insert the negative pole of the
batteries first. Check if the polarity
of the batteries is correct.
RESET button
NOTE : 1. If RESET button is not pressed, the remote controller may not operate correctly.
2. This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced.
This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by
the battery replacement.
5. How to install the horizontal vane
If horizontal vane is not installed correctly, all of the operation indicator lamps will blink.
In this case, install the horizontal vane correctly by following the procedures 1 to 2.
NOTE : Before installation of the horizontal vane, turn OFF the power supply.
In procedure 2lock the
stoppers until they click
2
into place.
Lock
1
20
10-2. FAILURE MODE RECALL FUNCTION
Outline of the function
This air conditioner can memorize the abnormal condition which has occurred once.
Even though LED indication listed on the troubleshooting check table (10-4.) disappears, the memorized failure details
can be recalled.
This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.
1. Flow chart of failure mode recall function for the indoor/outdoor unit
Operational procedure
The cause of abnormality cannot be found because the abnormality doesn't recur.
Setting up the failure mode recall function
Turn ON the power supply.
<
>
Preparation of the remote controller
1While pressing both OPERATION SELECT button and TOO COOL button on the
remote controller at the same time, press RESET button.
2First, release RESET button.
And release the other two buttons after all LCD in operation display section of the
remote controller is displayed after 3 seconds.
W1. Regardless of normal or abnormal condition,
a short beep is emitted once the signal is
received.
Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature
is displayed) with the remote controller headed towards the indoor unit. W1
No
(OFF)
Does POWER lamp on the indoor unit blink at the
interval of 0.5 seconds?
Blinks: Either indoor or outdoor unit is abnormal.
Beep is emitted at the same timing
Indoor unit is normal.
But the outdoor unit might be abnormal because there are some
abnormalities that can't be recalled with this way.
Confirm if outdoor unit is abnormal according to the detailed outdoor
unit failure mode recall function.
as the blinking of POWER lamp. W2
Yes
(Blinks)
Judgment of indoor/outdoor abnormality
Before blinking, does POWER lamp stay
ON for 3 seconds?
Yes
Stays ON for 3 seconds (without beep):
The outdoor unit is abnormal.
No
The indoor unit is abnormal.
The outdoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the indoor unit
failure mode table(10-2.4.).
Make sure to check at least two consecutive blinking cycles. W2
Check the blinking pattern, and confirm the abnormal point with the
outdoor unit failure mode table (Refer to outdoor unit service manual.)
Make sure to check at least two consecutive blinking cycles. W3
Releasing the failure mode recall function
Release the failure mode recall function by the following procedures.
Turn OFF the power supply and turn it ON again.
Press RESET button of the remote controller.
Repair the defective parts.
Deleting the memorized abnormal condition
1After repairing the unit, recall the failure mode again according to
"Setting up the failure mode recall function" mentioned above.
2Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed)
with the remote controller headed towards the indoor unit.
3Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
4Release the failure mode recall function according to "Releasing the failure mode recall function"
mentioned above.
NOTE: 1.Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.
2.If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
W2. Blinking pattern when the indoor unit is abnormal:
Blinking at 0.5-
second interval
Blinking at 0.5-
second interval
2.5-second OFF
2.5-second OFF
ON
OFF
Beeps
Beeps
Beeps
Repeated cycle
Repeated cycle
Repeated cycle
W3.Blinking pattern when the outdoor unit is abnormal:
Blinking at 0.5-
Blinking at 0.5-
second interval
2.5-second OFF
3-second ON
second interval
2.5-second OFF
3-second ON
ON
OFF
No beep
Beeps
No beep
Beeps
Repeated cycle
Repeated cycle
Repeated cycle
21
2. Flow chart of PLASMA operation failure mode recall function
Operational procedure
The plasma electrode unit might be abnormal. Confirm if plasma electrode
unit is abnormal according to the following procedures.
Confirm that the remote controller is in the failure mode recall
function.
With the remote controller headed towards the indoor unit, press TOO COOL or TOO
WARM button to adjust the set temperature to 23 :. W1
W1. Regardless of normal or abnormal condition, a short
beep is emitted as the signal is received.
Does POWER lamp on the indoor unit blink at the
interval of 0.5 seconds?
No
(OFF)
Blinks: The plasma electrode unit is abnormal.
Beep is emitted at the same timing as the
blinking of POWER lamp.
W2
Yes
(Blinks)
The plasma electrode unit is abnormal.
Check the blinking pattern, and refer to confirm the abnormal point
with the PLASMA operation failure mode table (10-2.5.).
The plasma electrode unit is normal.
Make sure to check at least two consecutive blinking cycles. W2
Releasing the failure mode recall function
Release the failure mode recall function by the following procedures.
Turn OFF the power supply and turn it ON again.
Press RESET button of the remote controller.
Release the failure mode recall function according to the left
mentioned procedure.
Repair the defective parts.
Deleting the memorized abnormal condition
1After repairing the unit, recall the failure mode again according to
"Setting up the failure mode recall function" mentioned above.
2Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed)
with the remote controller headed towards the indoor unit.
3Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
4Release the failure mode recall function according to "Releasing the failure mode recall function"
mentioned above.
NOTE1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
W2.Blinking pattern when plasma unit is abnormal:
Blinking at 0.5-
second interval
Blinking at 0.5-
second interval
2.5-second OFF
2.5-second OFF
ON
OFF
Beeps
Beeps
Beeps
Repeated cycle
Repeated cycle
Repeated cycle
3. PLASMA operation check
PLASMA operation goes ON when PLASMA button on the remote controller is pressed with any set temperature displayed
during failure mode recall function.
PLASMA lamp
Correspondence
Continuously blinking
Follow "Check of PLASMA operation" to identify the error.(Refer to 10-6.F)
There is failure in PLASMA operation control circuit on the indoor electronic control
2-time flash
Not lighted
P.C. board.(Refer to 10-6.F)
Normal
22
4. Indoor unit failure mode table
Abnormal point
(Failure mode)
POWER lamp
Not lighted
Condition
—
Correspondence
—
Normal
The room temperature thermistor short
or open circuit is detected every 8 seconds
during operation.
Room temperature
thermistor
Refer to the characteristics of the room
temperature thermistor (10-7.).
1-time flash
every 0.5-second
The indoor coil thermistor short or open
circuit is detected every 8 seconds during
operation.
Refer to the characteristics of the main
indoor coil thermistor, the sub indoor coil
thermistor (10-7.).
2-time flash
2.5-second OFF
Indoor coil thermistor
Serial signal
3-time flash
2.5-second OFF
The serial signal from outdoor unit is
not received for 6 minutes.
Refer to 10-6.D"How to check miswiring
and serial signal error".
The rotational frequency feedback signal is
not sent out for 12-seconds after indoor fan
motor is operated.
Refer to 10-6.A"Check of indoor fan
motor".
11-time flash
2.5-second OFF
Indoor fan motor
Indoor control system
It cannot properly read data in the
nonvolatile memory of the indoor electronic
control P.C. board.
Replace the indoor electronic control
P.C. board.
12-time flash
2.5-second OFF
NOTE : Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.).
5. PLASMA operation failure mode table
Abnormal point
(Failure mode)
POWER lamp
1-time flash
Condition
Correspondence
PLASMA power supply cannot be turned
OFF even if the PLASMA operation is turned
OFF with the remote controller.
Replace the indoor electronic control
P.C.board.
PLASMA power supply
control
The voltage between CN1 3(+) and 2(GND)
on the PLASMA POWER P.C.board falls
below 1.6 V(spark discharge judgment
voltage).
2-time flash
3-time flash
Spark discharge
The voltage between CN1 3(+) and 2(GND)
on the PLASMA POWER P.C.board falls by
0.9 V below the normal voltage value (3 V).
Refer to 10-6.F"Check of PLASMA
operation".
Abnormal electric
discharge error 1
The voltage between CN1 3(+) and 2(GND)
on the PLASMA POWER P.C.board falls
significantly. (0.4 V / 0.5 ms)
Abnormal electric
discharge error 2
4-time flash
5-time flash
The voltage between CN1 3(+) and 2(GND)
on the PLASMA POWER P.C board rises
above the normal voltage value (3 V).
PLASMA DEODORIZING
NOTE1 : Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.).
NOTE2 : As soon as an abnormality is detected, PLASMA operation goes OFF, therefore measuring
instrument which records the voltage wave is required in order to perform the above mentioned voltage
measurement.
NOTE3 : When POWER lamp flashes 1-time or 2-time, Please perform PLASMA operation check (Refer to 10-2.3).
23
10-3. INSTRUCTION OF TROUBLESHOOTING
w"Test Run operation"
means the operation
within 30 minutes after
EMERGENCY OPERATION
switch is pressed.
If blinking of OPERATION
INDICATOR lamp cannot
be checked, it can be checked
with failure mode recall function.
Start
Indoor unit operates.
Outdoor unit doesn't
operate normally.
OPERATION
Indoor unit
operates.
Outdoor unit
doesn't
Indoor unit
INDICATOR
lamp on the
indoor unit is
flashing on
and off.
doesn't receive
the signal from
remote controller.
operate.
Outdoor unit
operates only
in Test Run
Indoor unit
Outdoor unit
doesn't
operate
even in
Test Run
operation. w
Unit doesn't
operate
normal
operation in
COOL or
HEAT mode.
Indoor unit
doesn't operate,
when
EMERGENCY
OPERATION
switch is pressed.
PLASMA lamp 2-time flash
cause:
Indoor unit
• Trouble of PLASMA
operation
operates, when
EMERGENCY
OPERATION
operation. w
switch is pressed.
Refer to
"How to check
inverter/
Refer to
"Check of
R.V. coil".
Refer to 10-6.B
"Check of
remote controller
and receiver
P.C. board".
1. Check indoor / outdoor
connecting wire.
(Check if the power
is supplied to the
indoor unit.)
2. Refer to 10-6.C
"Check of indoor
electronic control
P.C. board and indoor
fan motor".
Refer to 10-6.F"Check of
PLASMA operation".
Check room
temperature
thermistor.
Refer to 10-7.
"Test point
diagram and
voltage".
compressor".
Refer to outdoor unit service manual.
POWER lamp
7-time flash
Cause:
Outdoor unit
• Trouble of
outdoor
All lamps
POWER lamp POWER lamp POWER lamp POWER lamp POWER lamp POWER lamp
POWER lamp
14-time flash
Cause:
Outdoor unit
• Other
Flash on and off
at 0.5-second
intervals
Flash on and off 2-time flash
3-time flash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
5-time flash
Cause:
Outdoor unit
• Outdoor
power
6-time flash
Cause:
4-time flash
Cause:
Indoor unit
• Trouble of
indoor unit
control
at 0.5-second
intervals
Cause:
Indoor unit
• Trouble of
room temp-
erature/
Outdoor unit
• Trouble of
thermistor
in outdoor
unit
Cause:
Cause:
Indoor unit
• The horizontal
vane is not
installed
Indoor/
abnormality
Outdoor unit
• Miswiring
or trouble
of serial signal
control
system
system
indoor coil
thermistor
system
abnormality
correctly.
Refer to 10-6.
A"Check of
indoor fan
motor".
Replace the Refer to
indoor
Refer to
"How to check "Check of
Replace the
inverter P.C.
board or
Check
Refer to 10-6. Refer to 10-6. Check room
E "Check of D "How to
installation of check of
the horizontal miswiring
temperature
thermistor
and indoor
coil thermis-
tor.
"Flow chart of
the detailed
outdoor unit
failure mode
recall function."
electronic
control
inverter/
compressor".
outdoor
thermistors". the outdoor
electronic
vane".
and serial
P.C. board.
control P.C.
signal error
.
Refer to 10-7.
"Test point
diagram and
voltage".
board.
24
10-4. TROUBLESHOOTING CHECK TABLE
Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
When the indoor unit has started operation and the following detection method has detected an abnormality (the first detection
after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with OPERATION INDICATOR
lamp flashing.
Lighted
L AREA R
POWER CLEAN PLASMA
Blinking
Not lighted
Abnormal
point
No.
1
Operation indicator lamp
Symptom
Condition
Correspondence
POWER lamp flashes.
0.5-second ON
• Refer to 10-6.D"How to check
miswiring and serial signal
error".
Miswiring
or serial
signal
The serial signal from the outdoor unit is not
received for 6 minutes.
0.5-second OFF
Indoor coil
thermistor
POWER lamp flashes.
2-time flash
• Refer to 10-7.the
The indoor coil or the room temperature
thermistor is short or open circuit.
characteristics of indoor coil
thermistor, and the room
temperature thermistor.
2
Room
temperature
thermistor
2.5-second OFF
POWER lamp flashes.
3-time flash
The rotational frequency feedback signal is
not emitted during the indoor fan operation.
• Refer to 10-6.A"Check of
indoor fan motor".
Indoor fan
motor
3
4
5
2.5-second OFF
POWER lamp flashes.
4-time flash
Indoor
control
system
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
• Replace the indoor electronic
control P.C. board.
Indoor unit
and outdoor
unit do not
operate.
2.5-second OFF
POWER lamp flashes.
5-time flash
• Refer to "How to check of
inverter/compressor".
Refer to outdoor unit service
manual.
It consecutively occurs 3 times that the
compressor stops for overcurrent protection or
start-up failure protection within 1 minute after
start-up.
Outdoor
power
system
• Check the stop valve.
2.5-second OFF
POWER lamp flashes.
6-time flash
• Refer to "Check of outdoor
thermistor".
Refer to outdoor unit service
manual.
The outdoor thermistors short or open circuit
during the compressor operation.
Outdoor
thermistors
6
7
2.5-second OFF
2.5-second OFF
• Replace the inverter P.C.
board or the outdoor
electronic control P.C. board.
Refer to outdoor unit service
manual.
POWER lamp flashes.
7-time flash
Outdoor
control
system
It cannot properly read data in the nonvolatile
memory of the inverter P.C. board or the
outdoor electronic control P.C. board.
POWER lamp flashes.
14-time flash
• Check the stop valve.
• Confirm the abnormality in
detail using the failure mode
recall function for outdoor
unit.
Other
abnormality
An abnormality other than above mentioned is
detected.
8
9
2.5-second OFF
• Check the blinking pattern of
the LED on the inverter P.C.
board or the outdoor
electronic
It cannot properly read data in the nonvolatile
memory of the inverter P.C. board or the
outdoor electronic control P.C. board.
Outdoor unit
does not
operate.
Outdoor
control
system
POWER lamp lights up.
control P.C. board.
25
L AREA R
POWER CLEAN PLASMA
Abnormal
point
No.
1
Operation indicator lamp
Symptom
Condition
Correspondence
All lamps flash at the same time.
0.5-second ON
Attachment
of the
horizontal
vane
Indoor unit
and outdoor
unit do not
operate.
• Refer to 10-6.E "Check of
installation of the horizontal
vane".
The electricity is not conducted to the interlock
switch (Fan) of the horizontal vane.
0.5-second OFF
L AREA R
POWER CLEAN PLASMA
Abnormal
point
No.
1
Operation indicator lamp
Symptom
Condition
Correspondence
POWER lamp is lighted.
AREA lamps flash.
The operation mode of the each indoor unit is
differently set to COOL (includes DRY) and
HEAT at the same time, the operation mode of
the indoor unit that has operated at first has the
priority.
Outdoor unit
operates but
indoor unit
does not
MXZ type
Operation
mode
• Unify the operation mode.
Refer to outdoor unit service
manual.
setting
operate.
2.5-second OFF
L AREA R
POWER CLEAN PLASMA
Abnormal
point
No.
1
Operation indicator lamp
Symptom
Condition
Correspondence
PLASMA lamp flashes.
2-time flash
Indoor unit
and outdoor
unit do not
operate.
PLASMA operation can not be turned OFF
even if the PLASMA operation is turned OFF
with remote controller.
•Refer to 10-6.F"Check of
PLASMA operation".
PLASMA
control
2.5-second OFF
26
10-5. TROUBLE CRITERION OF MAIN PARTS
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS
Part name
Check method and criterion
Measure the resistance with a tester.
Figure
Room temperature
thermistor(RT11)
Refer to 10-7. "Test point diagram and voltage", "Indoor electronic control
P.C. board", the chart of thermistor.
Indoor coil thermistor
(RT12, RT13)
Indoor fan motor(MF)
Check 10-6. A.
RED
Measure the resistance between the terminals with a tester.
ROTOR
(Part temperature 10 ~ 30 °C)
Horizontal vane
motor(MV1)
YLW
BRN
Color of the lead wire
BRN-other one
Normal
336 "~ 364 "
GRN
ORN
RED
Measure the resistance between the terminals with a tester.
Vertical vane
motor(MV2)
i-see Sensor
motor(MT)
ROTOR
(Part temperature 10 ~ 30 °C)
YLW
BRN
Color of the lead wire
BRN-other one
Normal
282 "~ 306 "
GRN
ORN
Cover the i-see Sensor with black vinyl tape. Then, turn ON the power
supply. (i-see Sensor is energized.) Measure the voltage between
connector terminals of i-see Sensor with a tester.
(Part temperature 10 ~ 40 °C)
i-see Sensor
Cover the i-see
Sensor with
black vinyl tape.
w
4
3
2(GND)
1
i-see Sensor(RR)
i-see Sensor P.C. board
connector
Black vinyl tape
i-see Sensor
connector terminals
Normal range
2(GND)
-
4(+) 1.874 ~ 3.387 VDC
1(+) 2(GND) 1.010 ~ 1.420 VDC
-
NOTE: Pay attention to static electricity.
PLASMA electrode unit
Check 10-6. F
27
10-6. TROUBLESHOOTING FLOW
POWER lamp flashes 3-time.
Indoor fan does not operate.
A
Check of indoor fan motor
The indoor fan motor error has occurred, and the indoor fan doesn't operate.
Turn OFF the power supply.
Pay careful attention to the high voltage on
the fan motor connector CN211.
Turn ON the power supply, wait 5 seconds or more, and then press
EMERGENCY OPERATION switch.
Measure the supply voltage as follows within 12 seconds after
EMERGENCY OPERATION switch is pressed.
If more than 12 seconds passes by, turn OFF the power supply and
turn ON it again, then measure the voltage. w
Is there any foreign matter that
interferes the rotation of the line
flow fan?
No
1.Measure the voltage between CN211 1(+) and 3(-).
2.Measure the voltage between CN211 5(+) and 3(-).
Yes
wIf more than 12 seconds passes after EMERGENCY OPERATION switch
is pressed, the voltage mentioned above 2 goes 0 VDC although the
indoor electric control P.C. board is normal.
Remove the foreign matter and
adjust the line flow fan.
Is there 325 VDC between
CN211
CN211 1 (+) and 3 (-), and does
the voltage between CN211 5(+)
and 3(-) rise to the range of 3 to 6
VDC within 12 seconds after
Indoor electronic
control P.C. board
Yes
Replace the indoor fan motor.
EMERGENCY OPERATION switch
is pressed?
No
Replace the indoor electronic control P.C. board.
The indoor fan motor error has occurred, and the indoor fan repeats "12-second ON and 30-second OFF" 3 times, and then stops.
No
Measure the voltage between CN211
6(+) and 3(-) while the fan motor is
rotating.
(Changed)
Is it unchanged holding
0 or 15 VDC?
Replace the indoor electronic control P.C. board.
Yes
(Unchanged)
Replace the indoor fan motor.
28
Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller.
B Check of remote controller and indoor electronic control P.C. board
wCheck if the remote controller is exclusive for this air conditioner.
Press OPERATE/STOP(ON/OFF) button on the remote controller.
No
Is LCD display on the remote con-
Replace the batteries. (Refer to 10-1.4.)
troller visible?
(not clear)
Yes
Remove the batteries, then set them back
and press RESET button. (Refer to 10-
1.4.) Check if the unit operates with the
remote controller.
No
Turn ON a radio to AM and press
OPERATE/STOP(ON/OFF) button on the remote controller.
Does the unit operate with the
remote controller?
Yes
OK
No
Replace the remote controller.
Is noise heard from radio?
Yes
Are there any fluorescent lights of
inverter or rapid-start type within
the range of 1 m?
Yes
✽✽Reinstall the unit away from lights.
✽✽Attach a filter on receiving part.
No
Replace the indoor electronic
control P.C. board.
(including the receiver)
29
The unit does not operate with the remote controller.
Also, POWER lamp does not light up by pressing EMERGENCY OPERATION switch.
C Check of indoor P.C. board and indoor fan motor
Turn OFF the power supply.
Remove indoor fan motor connector CN211, vane motor
connector CN151 and the i-see Sensor motor connector
CN110 from the indoor electronic control P.C. board and
turn ON the power supply.
Short/open circuit:
Measure the resistance of the i-see Sensor
motor coil.
Refer to 10-5.
Replace the i-see Sensor motor
and the indoor electronic control P.C.
board.
Yes
Does the unit operate with the remote controller?
Does POWER lamp light up by pressing EMERGENCY
OPERATION switch?
Short/open circuit:
Replace the indoor fan motor.
Measure the resistance between CN211 3
and 4 of the indoor fan motor connector.
No
Short/open circuit:
Measure the resistance of the horizontal vane
motor coil and the vertical vane motor coil.
Refer to 10-5.
Replace the horizontal vane motor, the
vertical vane motor and the indoor
electronic control P.C. board.
Replace the varistor(NR11) and fuse(F11).
Yes
No
Are the varistor(NR11) burnt
and the fuse(F11) blown?
Turn OFF the power supply.
Check both “parts side” and “pattern
side” of the indoor electronic control P.C.
board visually.
Be sure to check both the fuse
and the varistor in any case.
No
Is the fuse(F11) blown only?
Yes
Measure the resistance between
1(+) and 3(-) of the indoor fan
motor connector.
w1. The fan motor connector's 1 lead wire is red, whereas 3 is black.
w2. Connect "+" of the tester to fan motor connector's 1 lead
wire, and "-" to 3 lead wire, otherwise the resistance cannot be
measured properly.
w1,w2
No
Is the resistance 1 M"
or more?
Replace the fuse (F11) and the indoor fan motor.
Yes
Replace the fuse (F11).
No
Measure the resistance of cement
resistor(R111) on the indoor electronic
control P.C. board.
Is the resistance
approx. 4 "?
Replace the indoor electronic control P.C. board
and the indoor fan motor.
Yes
Replace the indoor electronic control P.C. board.
30
• Unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch.
Indoor unit does not operate.
• POWER lamp flashes ON and OFF every 0.5-seconds.
Outdoor unit does not operate.
D
How to check miswiring and serial signal error
Turn OFF the power supply.
Is there rated voltage
in the power supply?
Check the power
supply.
No
No
Yes
Turn ON the power supply.
Is there rated voltage between
outdoor terminal block S1 and
S2?
Check the wiring.
Yes
Press EMERGENCY OPERATION switch once.
Does AREA-L lamp light up?
<Confirmation of the power to the indoor unit>
No
No
Yes
Is there any miswiring,
poor contact, or wire
disconnection of the
indoor/outdoor
Yes
Is serial signal error indicated 6 minutes later?
Yes
Correct them.
connecting wire?
No
A
Turn OFF the power supply.
Check once more if the indoor/outdoor
connecting wire is not miswiring.
B
Short-circuit outdoor terminal block S2 and
S3.
W1
W1. Miswiring may damage indoor electronic control
P.C. board during the operation.
Be sure to confirm the wiring is correct before the
operation starts.
W3. Be sure to check this within 3 minutes after turning
ON. After 3 minutes, LED blinks 6 times. Even when
the inverter P.C.board or the outdoor electronic control
P.C.board is normal, LED blinks 6 times after
3 minutes.
Turn ON the power supply.
(Except for outdoor unit of multi system type)
Does the LED on the inverter P.C. board
or the outdoor electronic control P.C.board
repeat "3.6-second-OFF and 0.8-second-ON
Replace the inverter P.C. board or
the outdoor electronic control P.C.board.
W2
No
(Lighted or
not lighted)
quick blinking"?
W3
W2 Be careful to the residual
Yes
voltage of smoothing capacitor.
Turn OFF the power supply.
Remove the short-circuit between
outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20 VDC
between outdoor terminal block S2
and S3? <Confirmation of serial
signal>
Is there any error of the
Replace the
indoor/outdoor
connecting wire.
indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
Yes
No
A
· Turn OFF inverter-controlled lighting
equipment.
· Turn OFF the power supply and then
turn ON again.
No
Yes
· Press EMERGENCY OPERATION
switch.
Is there any error of the
Is there rated voltage between
indoor terminal block S1 and S2?
<Confirmation of power voltage>
indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
Replace the
indoor/outdoor
connecting wire.
· Reinstall
either the
unit or the
light each
other away.
· Attach a filter
on remote
control
receiving
section of
the indoor
unit.
Yes
No
Yes
No
Is serial signal
error indicated
6 minutes later?
No
Replace the indoor electronic control P.C. board.
Yes
Be sure to release the failure-mode
recall function after checking.
B
31
All lamps flash ON and OFF every 0.5-second.
Indoor unit and outdoor unit do not operate.
Check of installation of the horizontal vane
E
Turn OFF the
power supply.
No
Relock the stopper of the
horizontal vane to the indoor unit.
(Refer to 10-1.5.)
Is the stopper of the horizontal vane
locked to the indoor unit correctly?
Yes
Turn ON the
power supply.
No
Are all lamps flashing?
Yes
OK
To check the continuity of the interlock switch
Turn OFF the
power supply.
(Fan), measure the resistance of connector 1 - 2
connected to CN1R1 on the indoor electronic
control P.C. board.
No(∞
)
Replace the
interlock switch(Fan).
Is there resistance 0 "?
Yes
Replace the
indoor electronic
control P.C. board.
PLASMA lamp flashes 2-time.
POWER lamp flashes 1 to 5 times while PLASMA operation failure mode (Refer to 10-2.5) is recalled.
F
Check of PLASMA operation
After performing the check, make sure to release the failure mode recall function.
High voltage (approx. -4.4 kV) is generated during PLASMA
operation.
Turn ON the power supply.
Pay careful attention and never touch PLASMA ELECTRODE
UNIT and the high-voltage lead part (red wire).
Yes
Does PLASMA lamp flash
2-time with unit stopping?
Replace the indoor electronic control P.C. board.
No
1 While pressing both OPERATION SELECT button and
TOO COOL button on the remote controller at the same time,
press RESET button.
2 First, release RESET button.
And release the other two buttons after all LCD except the set
temperature in operation display section of the remote
controller is displayed after 3 seconds.
3 Press OPERATE/STOP (ON/OFF) button (the set temperature
is displayed)
4 And press PLASMA button once with the remote controller
headed towards the indoor unit. w1
PLASMA operation is selected.
PLASMA
operation
wThe plasma operation check mode is set.(Refer to 10-2.5.)
w1 Regardless of normal or abnormal condition,
a short beep is emitted once the signal
is received.
OFF
Does PLASMA lamp stay OFF, or continuously
blink?
Normal
w2 Turn PLASMA operation OFF and ON again.
(For turning OFF PLASMA operation, refer to 10-2.3.)
(If it goes normal without turning OFF and ON, PLASMA lamp doesn't go OFF.)
Continuously blinking.
Replace the PLASMA POWER P.C. board.
32
Electromagnetic noise enters into TV sets or radios
G
No
Is the unit earthed?
Yes
Earth the unit.
Is the distance between the
antennas and the indoor
unit within 3 m, or is the
distance between the
antennas and the outdoor
unit within 3 m?
Extend the distance between
the antennas and the indoor
unit, and/or the antennas and
the outdoor unit.
Yes
No
Is the distance between the
TV sets or radios and the
indoor unit within 1 m, or is
the distance between the TV
sets or radios and the
Extend the distance between
the TV sets and/or radios and
the indoor unit, or the TV sets
or radios and the outdoor unit.
Yes
outdoor unit within 3 m?
No
Are the antennas damaged?
Is the coaxial cable damaged?
Is there any poor contact in
the antenna wiring?
Yes
Yes
Replace or repair the antenna.
Replace or repair the coaxial cable.
No
Is the indoor/outdoor
Extend the distance between
the indoor/outdoor connecting
wire of the air conditioner and
the wiring of the antennas.
connecting wire of the air
conditioner and the wiring of
the antennas close?
No
Even if all of the above conditions are fulfilled, the electromagnetic noise may enter, depending on
the electric field strength or the installation condition (combination of specific conditions such as
antennas or wiring).
Check the followings before asking for service.
1.Devices affected by the electromagnetic noise
TV sets, radios (FM/AM broadcast, shortwave)
2.Channel, frequency, broadcast station affected by the electromagnetic noise
3.Channel, frequency, broadcast station unaffected by the electromagnetic noise
4.Layout of ;
indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, earth wire, antennas, wiring
from antennas, receiver
5.Electric field intensity of the broadcast station affected by the electromagnetic noise
6.Presence or absence of amplifier such as booster
7.Operation condition of air conditioner when the electromagnetic noise enters in.
1)Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for
the electromagnetic noise.
2)Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button
on the remote controller for power ON, and check for the electromagnetic noise.
3)After a short time (3 minutes later after turning ON), the outdoor unit starts running. During
operation, check for the electromagnetic noise.
4)Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the
outdoor unit stops but the indoor/outdoor communication still runs on. In this situation, check for
the electromagnetic noise.
33
10-7. TEST POINT DIAGRAM AND VOLTAGE
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS
1. Indoor electronic control P.C. board.
Cement resistor
(R111)
5 VDC
12 VDC
Indoor fan motor
(CN211)
1325 VDC
3(-) Fiducial terminal of
cathode side on measur-
ing high-voltage DC
415 VDC
5(+)3-6 VDC
6(+)0 or 15 VDC
Power supply input
230 VAC
Interlock switch(Fan)
(CN1R1)
Room temperature
thermistor RT11
(CN111)
{
SW P.C. Board
Emergency
operation
Varistor (NR11)
switch(SW1)
CN2011
(Used for check of con-
ducting of thermal fuse)
Indoor coil thermistor
RT12, RT13 (CN112)
Plasma electrode unit
(CN1T1)
Horizontal vane(CN1U1)
Vertical vanes(CN151)
Timer short mode
point JPG, JPS
(Refer to 8-1.)
}
Fuse
(F11)
i-see Sensor
(CN110)
(LD101)
1-3 : Connect to the monitor P.C.board
4-0 : Connect to the power monitor receiver
P.C.board
Release of Auto restart
function
Solder the Jumper wire
to JR07
(Refer to 8-3.)
Room temperature thermistor (RT11)
Indoor coil thermistor (RT12, RT13)
Temperature (:)
34
2. Power monitor receiver P.C. board
3. Monitor P.C. board
4. Plasma power P.C. board
CN1
3DC 2.5 V during PLASMA
DEODORIZING operation
2GND
1DC 12.5 V during PLASMA
DEODORIZING operation
35
11
DISASSEMBLY INSTRUCTIONS
<"Terminal with locking mechanism" Detaching points>
The terminal which has the locking mechanism can be detached as shown below.
There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism.
The terminal without locking mechanism can be detached by pulling it out.
Check the shape of the terminal before detaching.
(1) Slide the sleeve and check if there is a locking lever or not.
(2) The terminal with this connector has the
locking mechanism.
Sleeve
1Slide the sleeve.
1Hold the sleeve, and
2Pull the terminal while
pushing the locking
pull out the terminal
slowly.
Locking lever
lever.
Connector
NOTE :
Turn OFF power supply
before disassembling.
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS
OPERATING PROCEDURE
PHOTOS
1. Removing the panel
Photo 1
(1) Press and unlock the knobs on both sides of the front
panel and lift the front panel until it is level. Pull the hinges
forward to remove the front panel.
Horizontal vane
(2) Remove the horizontal vanes.
Front panel
(3) Remove the screw caps of the panel. Remove the screws.
(See Photo 1)
(4) Hold the lower part of both ends of the panel and pull it
slightly toward you, and then remove the panel by pushing
it upward.
Screws of the panel
36
OPERATING PROCEDURE
PHOTOS
2. Removing the electronic control P.C. board, the
power monitor receiver P.C. board, i-see Sensor, SW
P.C. board and the terminal block
Photo 2
(1) Remove the panel (Refer to 1.) and the corner box.
(2) Remove the screw of the V.A. clamp. Remove the V.A.
clamp and then the indoor/outdoor connecting wire. (See
Photo 2)
Screws of the
terminal block
cover
(3) Remove the sensor holder from the electrical cover. (See
Photo 3)
(4) Remove the screw of the electrical cover, and then the
electrical cover. (See Photo 3)
(5) Remove the earth wire connected to the indoor electronic
control P.C. board from the electrical box. (See Photo 3.)
(6) Remove the power monitor receiver P.C. board holder.
(See Photo 4.)
(7) Pull out the i-see Sensor from the power monitor receiver
P.C. board holder.
Drain hose
Screw of the V.A. clamp
Earth wire
( ) Install the i-see Sensor in its former position when assem-
w
bling it.(Refer to Photo 5)
(8) Open the rear cover of the power monitor receiver P.C.
board holder and pull out the power monitor receiver P.C.
board.
Photo 3
(9) Open the sensor holder and pull out the SW P.C. board.
(10) Pull the electronic control P.C. board slightly toward you
from the electrical box, and disconnect TAB3 and all the
connectors on the electronic control P.C. board.
(11) Pull out the electronic control P.C. board from the electrical
box.
Sensor holder
(12) Remove the earth wire connected to the heat exchanger
from the electrical box. (See Photo 3)
(13) Unhook the catches of the electrical box, and pull out the
electrical box.
(14) Remove the screw of the terminal block cover, and then
the terminal block cover and the terminal block holder.
(See Photo 3)
Screw of the
electrical cover
(15) Remove the terminal block by sliding it.
Sensor holder (inside)
Photo 4
SW P.C. board
Plasma power P.C. board holder
Power monitor receiver
P.C. board holder
i-see Sensor holder
37
OPERATING PROCEDURE
PHOTOS
3. Removing the electrical box
Photo 5
(1) Remove the panel (Refer to 1.) and the corner box.
(2) Remove the indoor/outdoor connecting wire, the sensor
holder, the electrical cover and the earth wire. (Refer to
2.)
(3) Disconnect the following connectors on the electronic con-
trol P.C. board;
fan motor <CN211>, indoor coil thermistor <CN112>, vane
motor <CN151>, interlock switch <CN1R1>, plasma power
P.C. board <CN1T1>.
(4) Unhook the catches of the electrical box, and pull out the
electrical box. (See Photo 3)
Be sure to assemble the i-see Sensor
in the correct position
4. Removing the nozzle assembly
Photo 6
(1) Remove the panel (Refer to 1.) and the corner box.
(2) Remove the V.A. clamp, and then the indoor/outdoor con-
necting wire. (See Photo 2)
Interlock switch
(3) Remove the sensor holder and the electrical cover. (See
Photo 3.)
(4) Disconnect the following connectors on the electronic con-
trol P.C. board;
vane motor <CN151>, interlock switch<CN1R1>.
(5) Remove the power monitor receiver P.C. board holder and
the plasma power holder P.C. board holder. (See Photo 4)
(6) Pull out the drain hose from the nozzle assembly and
remove the nozzle assembly.
Screws of the interlock switch
(7) Remove the interlock switch.
5. Removing the vertical vane motor unit
Photo 7
(1) Remove the nozzle assembly. (Refer to 4.)
(2) Remove the crank of the vertical vane motor unit from the
arm of the vertical vane.
Screws of the vertical vane motor unit cover
(3) Remove the screw of the vertical vane motor unit, and pull
the vertical vane motor unit.
(4) Remove the screws of the vertical vane motor unit cover.
(5) Remove the crank of the vertical vane motor unit from the
shaft of the vane motor.
( ) Only the crank of the left side vertical vane motor unit.
w
(See Photo 7)
Crank of the vertical
vane motor unit
Screw of the vertical
vane motor unit
(6) Remove the vertical vane motor from the the vertical vane
motor unit.
(7) Disconnect the connector of vertical vane motor from the
vertical vane motor.
Photo 8
Screws of the vertical vane motor unit cover
Screw of the vertical
vane motor unit
Crank of the vertical
vane motor unit
38
OPERATING PROCEDURE
PHOTOS
6. Removing the horizontal vane motor
(1) Remove the nozzle assembly.(Refer to 4.)
(2) Remove the screws of the horizontal vane motor unit, and
pull out the horizontal vane motor unit.
Photo 9
Screws of the horizontal
vane motor unit cover
(4) Remove the screws of the horizontal vane motor unit
cover.
(5) Remove the horizontal vane motor from the horizontal
vane motor unit.
(3) Disconnect the connector from the horizontal vane motor.
Screws of the horizontal vane motor unit
7. Removing the indoor fan motor and the line flow fan
(1) Remove the panel (Refer to 1.) and the corner box.
(2) Remove the sensor holder, the power monitor receiver P.C.
board holder, the electrical box (Refer to 3.) and the nozzle
assembly (Refer to 4.).
Photo 10
Motor band
(4) Remove the screws fixing the motor bed. (See Photo 10)
(5) Loosen the screw fixing the line flow fan. (See Photo 11)
(6) Remove the motor bed together with fan motor and motor
band.
(7) Release the hooks of the motor band. Remove the motor
band. Pull out the indoor fan motor.
(8) Remove the indoor coil thermistor from the heat exchang-
er.
Screws of
the motor bed
( ) Install the indoor coil thermistor (RT12) in its former posi-
w
tion when assembling it. (Refer to Photo 13)
(9) Remove the screws fixing the left side of the heat
exchanger. (See Photo 12)
(10) Lift the heat exchanger, and pull out the line flow fan to the
lower-left.
Photo 11
Photo 13
Screw of
the line flow fan
Photo 12
Indoor coil thermistor (RT12)
Screws of the
left side of the
heat exchanger
39
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
C Copyright 2007 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
New publication, effective Aug. 2007
Specifications subject to change without notice.
Distributed in Aug. 2007. No. OBH488 6
Made in Japan
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