Revision A:
• 3. SPECIFICATION has been corrected.
Please void OBH497.
INDOOR UNIT
No. OBH497
REVISED EDITION-A
SERVICE MANUAL
Wireless type
Models
MSZ-FD09NA
MSZ-FD12NA
Outdoor unit service manual
MUZ-FD•NA Series (OBH498)
MXZ-A·NA Series (OB444)
CONTENTS
·······································
1. TECHNICAL CHANGES
3
2. PART NAMES AND FUNCTIONS····················· 4
3. SPECIFICATION················································ 5
4. OUTLINES AND DIMENSIONS ························ 7
5. WIRING DIAGRAM············································ 8
6. REFRIGERANT SYSTEM DIAGRAM··············· 9
7. SERVICE FUNCTIONS ··································· 10
8. MICROPROCESSOR CONTROL ··················· 12
9. TROUBLESHOOTING····································· 22
10. DISASSEMBLY INSTRUCTIONS···················· 36
PARTS CATALOG (OBB497)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
TECHNICAL CHANGES
1
MSZ-FD09NA
MSZ-FD12NA
1. New model.
3
2
PART NAMES AND FUNCTIONS
MSZ-FD09NA MSZ-FD12NA
AREA lamp
POWER lamp
Remote control
receiving section
Operation indicator
lamp
Front panel
Air filter
Air inlet
Remote controller
Platinum deodorizing filter
Anti-allergy Enzyme Filter
i-see Sensor
Air outlet
Emergency operation switch
Heat exchanger
Fan
Horizontal vane
AREA lamp indicates 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 control operation
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 × 25 mm
Remote controller holder
Fixing screw for 3.5 × 1.6 mm (Black)
Battery (AAA) for remote controller
Wireless remote controller
1
5
1
2
2
1
1
Felt tape (Used for left or left-rear piping)
4
3
SPECIFICATION
Indoor model
Power supply
Max. fuse size (time delay)/ Disconnect switch
Min. circuit ampacity
Fan motor
MSZ-FD09NA
MSZ-FD12NA
V, phase, Hz
208/230 , 1 , 60
15
A
A
1.0
1.0
F.L.A
CFM
0.76
HEAT Dry
166 - 240 - 381
162 - 226 - 339
(144 - 202 - 307)
166 - 240 - 420
162 - 226 - 381
(144 - 202 - 350)
Airflow
Low - Med. - High
COOL Dry
CFM
(Wet)
Moisture removal
pt./h
dB(A)
dB(A)
in.
2.1
22 - 31 - 39
22 - 31 - 40
2.9
22 - 33 - 43
22 - 33 - 43
Cooling
Heating
Sound level
Low - Med. - High
Cond. drain connection O.D.
W
5/8
31-13/32
in.
Dimensions
D
H
in.
in.
10-1/8
11-5/8
Weight
Ib.
27
External finish
Remote controller
Control voltage (by built-in transformer)
Munsell 1.0Y 9.2/0.2
Wireless type
12-24 VDC
NOTE : Test conditions are based on ARI 210/240.
5
3-1. OPERATING RANGE
(1) POWER SUPPLY
Rated voltage
Guaranteed Voltage
Min.187 V 208 V 230 V Max.253 V
208/230 V
1 phase
60 Hz
Indoor unit
(2) OPERATION
Intake air temperature (°F)
Mode
Condition
Standard temperature
Maximum temperature
Minimum temperature
Maximum humidity
Indoor
78 %
Outdoor
DB
80
90
67
WB
67
73
DB
95
115
14
WB
—
—
Cooling
57
—
—
Standard temperature
Heating Maximum temperature
Minimum temperature
70
80
70
60
67
60
47
75
14
43
65
13
3-2. OUTLET AIR SPEED AND COVERAGE RANGE
● The air coverage range is the figure up
to the position where the air speed is 1
ft./sec., when air is blown out horizon-
tally from the unit properly at the High
speed position.
Airflow
(CFM)
Air speed
(ft./sec.)
Coverage
range (ft.)
Model
Mode
HEAT
Function
Dry
Dry
Wet
Dry
Dry
Wet
381
339
307
420
381
350
19.2
27.7
24.7
22.4
30.4
27.7
25.4
MSZ-FD09NA
17.1
COOL
HEAT
COOL
15.5
The coverage range should be used
only as a general guideline since it var-
ies according to the size of the room
and furniture arranged inside the room.
21.2
MSZ-FD12NA
19.2
17.6
6
4
OUTLINES AND DIMENSIONS
Unit : inch
7/16 X 13/16 Oblong hole
2-1/2
MSZ-FD09NA MSZ-FD12NA
7/16 X 1 Oblong hole
8-7/8
8-7/8
2-1/2
Installation plate
31-3/8
30-7/8
1/2
6-1/8 6-1/8
2-1/8
13-9/16
13
2-11/16
Indoor unit
Wall hole ø2-9/16
Air in
Installation plate
Piping
10-1/8
1/4
2-3/16
27-1/16
2-3/16
Drain hose
1-11/16
3-3/8
1-11/16
3-13/16
3/4
2-5/16
Air out
Insulation
Liquid line
Gas line
ø1-3/8 O.D
ø1/4 19-11/16 (Flared connection ø1/4)
ø3/8 16-15/16 (Flared connection ø3/8)
Insulation ø1-1/8 O.D Connected part ø5/8 O.D
Drain hose
7
5
WIRING DIAGRAM
MSZ-FD09NA MSZ-FD12NA
8
6
REFRIGERANT SYSTEM DIAGRAM
Unit:inch
MSZ-FD09NA MSZ-FD12NA
Refrigerant pipe 3/8
(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 1/4
(with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating
9
7
SERVICE FUNCTIONS
MSZ-FD09NA MSZ-FD12NA
7-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS the indoor electronic control P.C. board.
The time will be shortened as follows. (Refer to 9-7.)
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.)
7-2. 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) but-
ton twice or 3 times at first.
After finish modification, put back the bat-
teries 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
1 unit operation
2 units operation
3 units operation
Same as at left
Same as at left
Solder J2
4 units operation
Same as at left
No. 1 unit
No modification
Same as at left
No. 2 unit
No. 3 unit
No. 4 unit
—
—
—
Solder J1
Same as at left
—
—
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 will 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 has turned OFF, or the power supply has shut down.
Please conduct the above setting once again after the power has restored.
10
7-3. 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
If the main power has been cut, the operation settings remain.
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”
Turn off the main power of the unit.
Solder the Jumper wire JR07 on the indoor electronic control P.C. board. (Refer to 9-7.)
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
cancelled.
• 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.
7-4. 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 19-3/4 inch (50 cm).
Installed at right, if the
distance is not more
than 19-3/4 inch (50 cm).
(Left)
(Center)
(Right)
Is the indoor unit
installed at right,
left or center?
NOTE:If the indoor unit is installed more than 19-3/4 inch (50 cm) away from the side walls, cabinets or other nearby
objects, set the slide switch to the “center” position.
11
8
MICROPROCESSOR CONTROL
MSZ-FD09NA MSZ-FD12NA
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
POWERFUL button
TIME SET buttons
FORWARD button
BACKWARD button
Temperature buttons
WIDE VANE button
i-see button
AREA button
RESET button
(Vertical vane 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 8-7.
Lamp lights during operation.
Lamp blinks in abnormal condition.
POWER
12
8-1. 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 61 ~ 88°F (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.
8-2. 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. (8-1.1.)
2. Low outside temperature operation
Low outside temperature operation is as same as COOL mode. (8-1.2.)
8-3. 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 61 ~ 88°F (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.
13
8-4. 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 4°F (2°C) below
the set temperature.
HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 4°F (2°C) above
the set temperature.
NOTE1
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
Refer to NOTE 2 "FOR MULTI SYSTEM AIR CONDITIONER".
NOTE 2
HEAT) and becomes a state of standby.
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
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.
8-5. 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.
14
(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.
COOL and DRY operation
HEAT operation
Vane angle is fixed to Angle 1.
Vane angle is fixed to Angle 4.
1
(5) STOP (operation OFF) and ON TIMER standby
In the following cases, the horizontal vane returns to the closed position.
(a) OPERATE/STOP (ON/OFF) button is pressed (POWER OFF).
(b) The operation is stopped by the emergency operation.
(c) 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.
(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
When to use this function?
Use this function if you don’
COOL/DRY
HEAT
direction
Pressing and holding VANE
CONTROL button for 2
seconds or more cause the
horizontal vane to reverse
and move to horizontal
position.
The air conditioner starts the The air conditioner starts
t want the air from the indoor cooling or drying operation
unit to blow directly onto your approx. 3 minutes after
heating operation approx.
3 minutes after the vane
has moved to the horizontal
position.
body.
the vane has moved to the
• Depending on the shape of horizontal position.
the room, the air may blow • When VANE CONTROL
• Sometimes the area around
your feet may not warm.
To warm the area around
the feet, set the horizontal
directly onto your body.
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.
• Press VANE CONTROL
button again to return the
vane to the previously-set
position.
vane to
(AUTO) or the
downwardblowing position.
Horizontal
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.
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.
15
(
10) POWERFUL (
) operation.
The air conditioner automatically adjusts the fan speed and the set temperature, and operates the POWERFUL mode.
The POWERFUL mode is automatically released 15 minutes after operation starts, and the operation mode returns to
the mode prior to POWERFUL operation
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
The vane presses the vane stopper once to confirm the standard position and then set to the desired angle.
Confirming of standard position is performed in the following cases.
(a) OPERATE/STOP (ON/OFF) button is pressed (POWER ON).
(b) SWING is started.
(4) SWING MODE (
)
By selecting SWING mode with WIDE VANE button, the vertical vane swings horizontally.
The remote controller displays “ ”. Swing mode is cancelled when WIDE MODE button is pressed once again.
16
8-6. 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 batteries
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.
8-7. 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 cancelled, 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
17
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.
PressAREAbutton
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. 5.4 °F(3 °C) temperature difference.
• In AUTO of AREA setting, both right and left lamps are lighted when the room is evenly air-conditioned.
L
AREA
R
18
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 center
i-see Sensor turning to the left
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 ·····
19
8-8. 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 AM” blinks at the current time dis-
play 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 (
• Each time FORWARD button (
) to set the current time.
and
) is pressed, the set time increases by 1 minute, and each time
BACKWARD button (
) is pressed, the set time decreases by 1 minute.
• 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
(a) Press ON TIMER button (
) during operation.
(b) Set the time of the timer using TIME SET buttons (
).
and
OFF timer setting
(a) Press OFF TIMER button
during operation.
(
)
(b) Set the time of the timer using TIME SET buttons (
Each time FORWARD button (
).
and
) is pressed, the set time increases by 10 minutes; each time BACKWARD but-
) is pressed, the set time decreases by 10 minutes.
ton (
2. To release the timer
To release ON timer, press ON TIMER button (
To release OFF timer, press OFF TIMER button (
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.
PM
PM
PM
AM
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.
20
8-9. 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
75°F (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.
Operation mode
Set temperature
Fan speed
COOL
HEAT
75°F (24°C) 75°F (24°C)
Med.
Auto
Med.
Auto
Horizontal vane
Vertical vane
Straight
Straight
The operation mode is indicated by the AREA lamp as following
AREA lamp
EMERGENCY
COOL
L
AREA
R
Lighted
Not lighted
↓
EMERGENCY
HEAT
↓
STOP
NOTE:
This is the indication of EMERGENCY OPERATION mode.
AREA setting is not available during EMERGENCY OPERATION.
8-10. 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.
8-11. Changing temperature indication (°F/°C)
• The preset unit is °F.
• °F→°C : Press RESET button while the
temperature buttons are pressed.
• °C→°F : Press RESET button or remove
the batteries .
Press RESET button gently using
a thin stick.
21
9
TROUBLESHOOTING
MSZ-FD09NA MSZ-FD12NA
9-1. 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 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 9-2., 9-3. and 9-4.
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.
Remove the front lid and insert batteries.
Then reattach the front lid.
Press RESET button with tip end of ball point pen
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.
22
9-2. 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 (9-4.) 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>
While pressing both OPERATION SELECT button and TOO COOL button on the
remote controller at the same time, press RESET button.
First, 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.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is
displayed) with the remote controller headed towards the indoor unit.
1
1. Regardless of normal or abnormal condition, a short
beep is emitted once the signal is received.
Indoor unit is normal.
But the outdoor unit might be abnormal because there are some abnor-
malities that can't be recalled with this way.
Confirm if outdoor unit is abnormal according to the detailed outdoor unit
failure mode recall function.
Does the POWER lamp on the indoor unit blink at
the interval of 0.5 seconds?
Blinks: Either indoor or outdoor unit is abnormal.
No
(OFF)
Beep is emitted at the same timing as the
blinking of POWER lamp.
2
Yes
(Blinks)
Judgment of indoor/outdoor abnormality
Before blinking, does POWER lamp stay ON
for 3 seconds?
Stays ON for 3 seconds (without beep):
The outdoor unit is abnormal.
Yes
No
The outdoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the
outdoor unit failure mode table. (Refer to outdoor unit service manual.)
The indoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the indoor unit
failure mode table. (Refer to 9-2.2)
Make sure to check at least two consecutive blinking cycles.
Make sure to check at least two consecutive blinking cycles.
3
2
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
After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall
function" mentioned above.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed)
with the remote controller headed towards the indoor unit.
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
Release 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.
2. 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
3.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
23
2. Indoor unit failure mode table
Abnormal point
POWER
Condition
—
Correspondence
—
(Failure mode)
Not lighted
Normal
The room temperature thermistor short or open
circuit is detected every 8 seconds during op-
eration.
1-time flash every Room temperature
Refer to the characteristics of the room temperature
thermistor (9-7.).
0.5-second
thermistor
2-time flash
Indoor coil thermis- The indoor coil thermistor short or open circuit Refer to the characteristics of the main indoor coil
2.5-second OFF
tor
is detected every 8 seconds during operation.
thermistor, the sub indoor coil thermistor (9-7.).
3-time flash
2.5-second OFF
The serial signal from outdoor unit is not re-
ceived for a maximum of 6 minutes.
Refer to 9-6. "How to check miswiring and serial
signal error".
Serial signal
The rotational frequency feedback signal is
not emit during the 12 seconds the indoor fan
operation.
11-time flash
2.5-second OFF
Indoor fan motor
Refer to 9-6. "Check of indoor fan motor".
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
12-time flash
2.5-second OFF
Indoor control
system
Replace the indoor electronic control P.C. board.
NOTE : Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (9-4.).
24
9-3. INSTRUCTION OF TROUBLESHOOTING
Start
Indoor unit operates.
Indoor unit oper-
Indoor unit
OPERATION INDICATOR
lamp on the indoor unit is
flashing on and off.
Outdoor unit doesn't
ates.
doesn't receive
the signal from
remote controller.
operate normally.
Outdoor unit
doesn't operate.
If blinking of OPERATION INDI-
CATOR lamp cannot be checked,
it can be checked with failure
mode recall function.
Indoor unit
Indoor unit
Outdoor unit
operates only
in Test Run
operation.
Outdoor
Unit doesn't
operate nor-
mal operation
in COOL or
HEAT mode.
operates, when
EMERGENCY
OPERATION
doesn't operate,
when EMER-
GENCY OPERA-
TION switch is
pressed.
unit doesn't
operate even
in Test Run
operation.
"Test Run operation" means the
operation within 30 minutes af-
ter EMERGENCY OPERATION
switch is pressed.
switch is pressed.
1. Check indoor/out-
door connecting wire.
(Check if the power is
supplied to the indoor
unit.)
2. Refer to 9-6. "Check
of indoor electronic
control P.C. board and
indoor fan motor".
Check room
temperature
thermistor.
Refer to 9-7.
"Test point
diagram and
voltage".
Refer to
Refer to 9-6.
Refer to "How
to check
inverter/
"Check of R.V. "Check of remote
coil".
controller and
indoor elec-
tronic control P.C.
board".
compressor".
Refer to outdoor unit service manual.
POWER lamp POWER lamp
POWER lamp
POWER lamp POWER lamp POWER lamp POWER lamp POWER lamp
7-time flash 14-time flash
6-time flash
Cause:
Flash on and
2-time flash
3-time flash 4-time flash 5-time flash
Cause:
Cause:
off at 0.5-sec- Cause:
Cause:
Cause:
Cause:
Outdoor unit Outdoor unit
• Trouble of • Other ab-
outdoor con- normality
trol system
Outdoor unit
• Trouble of
thermistor in
outdoor unit
ond intervals
Cause:
Indoor unit
• Trouble of
Indoor unit Indoor unit
• Trouble of • Trouble
Outdoor unit
• Outdoor
power
Indoor/Outdoor room tem-
unit
indoor fan
motor
of indoor
unit control
system
perature /
indoor coil
thermistor
system
• Miswiring or
trouble of
serial signal
abnormality
Refer to 9-6. Check room Refer to 9-6. Replace the Refer to
Refer to
Replace the Check "Flow
inverter P.C. chart of the
board or the detailed
"How to
temperature
"Check of indoor elec-
"How to
"Check of
check miswir- thermistor
ing and serial and indoor
signal error". coil thermis-
tor. Refer
indoor fan
motor".
tronic control check invert- outdoor
P.C. board.
er/compres- thermistors". outdoor elec- outdoor unit
sor".
tronic control failure mode
P.C. board.
recall func-
tion."
to 9-7."Test
point diagram
and voltage".
25
9-4. 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
Blinking
Not lighted
Abnormal
point
No.
1
Operation indicator lamp
POWER lamp flashes.
Symptom
Condition
Correspondence
0.5-second ON
Miswiring
or serial
signal
• Refer to 9-6. "How to check
miswiring and serial signal er-
ror".
The serial signal from the outdoor unit is not
received for 6 minutes.
0.5-second OFF
POWER lamp flashes.
2-time flash
Indoor coil
thermistor
• Refer to 9-7.the characteristics
of indoor coil thermistor, and
the room temperature thermis-
tor.
The indoor coil or the room temperature
thermistor is short or open circuit.
2
3
4
5
6
7
8
9
Room tem-
perature
thermistor
2.5-second OFF
POWER lamp flashes.
3-time flash
Indoor fan
motor
The rotational frequency feedback signal is
not emitted during the indoor fan operation.
• Refer to 9-6. "Check of in-
door fan motor".
2.5-second OFF
POWER lamp flashes.
4-time flash
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
Indoor con-
trol system
• 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 in-
verter/compressor".
It consecutively occurs 3 times that the com-
pressor stops for overcurrent protection or
start-up failure protection within 1 minute after
start-up.
Outdoor
power sys-
tem
Refer to outdoor unit service
manual
• 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.
Outdoor
thermistors
The outdoor thermistors short or open circuit
during the compressor operation.
2.5-second OFF
POWER lamp flashes.
7-time flash
• Replace the inverter P.C. board
or the outdoor electronic con-
trol P.C. board.
Refer to outdoor unit service
manual.
Outdoor
control sys-
tem
It cannot properly read data in the nonvolatile
memory of the inverter P.C. board or the out-
door electronic control P.C. board.
2.5-second OFF
POWER lamp flashes.
14-time flash
• Check the stop valve.
Other ab-
normality
An abnormality other than above mentioned
is detected.
• Confirm the abnormality in
detail using the failure mode
recall function for outdoor unit.
2.5-second OFF
• Check the blinking pattern of
the LED on the inverter P.C.
board or the outdoor electronic
control P.C. board.
Outdoor
Outdoor unit
It cannot properly read data in the nonvolatile
control sys- POWER lamp lights up
tem
does not oper- memory of the inverter P.C. board or the out-
ate
door electronic control P.C. board.
26
L AREA R
POWER
Abnormal
point
No.
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 • Unify the operation mode.
HEAT at the same time, the operation mode Refer to outdoor unit service
of the indoor unit that has operated at first has manual.
the priority.
MXZ type
Operation
mode
Outdoor unit
operates but
indoor unit does
not operate.
1
setting
2.5-second OFF
27
9-5. TROUBLE CRITERION OF MAIN PARTS
MSZ-FD09NA MSZ-FD12NA
Part name
Check method and criterion
Figure
Room temperature therm- Measure the resistance with a tester.
istor (RT11)
Refer to 9-7. "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 9-6. .
Measure the resistance between the terminals with a tester.
(Part temperature 50 ~ 86°F (10 ~ 30°C))
RED
Horizontal vane motor
(MV1)
Color of the lead wire
Normal
ROTOR
YLW
BRN
Horizontal vane motor (MV1)
Vertical vane motor (MV2)
i-see Sensor motor (MT)
313 ~ 375 Ω
268 ~ 322 Ω
223 ~ 268 Ω
Vertical vane motor
(MV2)
BRN-other one
i-see Sensor motor
(MT)
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 50 ~ 104°F (10 ~ 40°C))
i-see Sensor
Cover the i-see
4
Sensor with
black vinyl tape.
3
2(GND)
1
i-see Sensor P.C. board
connector
i-see Sensor (RR)
Black vinyl tape
i-see Sensor connector terminals
(GND) - (+)
Normal range
1.874 ~ 3.387 VDC
1.010 ~ 1.420 VDC
(+) - (GND)
NOTE: Pay attention to static electricity.
28
9-6. TROUBLESHOOTING FLOW
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 EMER-
GENCY OPERATION switch is pressed.
Is there any foreign matter that interferes
the rotation of the line flow fan?
No
If more than 12 seconds passes by, turn OFF the power supply and
turn ON it again, then measure the voltage.
1. Measure the voltage between CN211 (+) and (-).
2. Measure the voltage between CN211 (+) and (-).
Yes
If more than 12 seconds passes after EMERGENCY OPERATION switch
is pressed, the voltage mentioned above 2 goes 0 VDC although the
indoor electronic control P.C. board is normal
Remove the foreign matter and
adjust the line flow fan.
Is there 294/325 VDC between
CN211
CN211 (+) and (-), and does the
voltage between CN211 (+) and (-)
rise to the range of 3 to 6 VDC within
12 seconds after EMERGENCY
OPERATION switch is pressed?
Indoor electronic
control P.C. board
Replace the indoor fan motor.
Yes
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.
Measure the voltage between CN211
Is it unchanged holding
(+) and (-) while the fan motor is
rotating.
Replace the indoor electronic control P.C. board.
0 or 15 VDC?
No
(Changed)
Yes
(Unchanged)
Replace the indoor fan motor.
29
B Check of remote controller and indoor electronic control P.C. board
Check if the remote controller is exclusive for this air conditioner.
Press OPERATE/STOP (ON/OFF)
button on the remote controller.
Is LCD display on the remote controller
Replace the batteries. (Refer to 9-1.4.)
visible?
No
(Not clear)
Yes
Remove the batteries, then set them back
and press RESET button. (Refer to 9-1.4.)
Check if the unit operates with the remote
controller.
Turn ON a radio to AM and press OP-
ERATE/STOP (ON/OFF) button on the
remote controller.
Does the unit operate with the remote
controller?
No
Yes
OK
Is noise heard from radio?
Yes
Replace the remote controller.
No
Are there any fluorescent lights of
inverter or rapid-start type within the
range of 3.28 ft.?
•Reinstall the unit away from lights.
•Attach a filter on receiving part.
Yes
No
Replace the indoor electronic control
P.C. board. (Including the receiver)
30
C Check of indoor electronic control 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.
Measure the resistance of the i-see
Sensor motor coil.
(Refer to 9-5.)
Short/open circuit:
Replace the i-see Sensor motor and the
indoor electronic control P.C. board.
Does the unit operate with the remote
controller?
Does POWER lamp light up by pressing
EMERGENCY OPERATION switch?
Measure the resistance between
CN211 and of the indoor fan motor
connector.
Short/open circuit:
Replace the indoor fan motor.
Yes
No
Short/open circuit:
Measure the resistance of the horizon-
tal vane motor coil and the vertical vane
motor coil.
Replace the horizontal vane motor, the
vertical vane motor and the indoor electronic
control P.C. board.
(Refer to 9-5.)
Replace the varistor (NR11)
and fuse (F11).
Yes
Are the varistor (NR11)
burnt and the fuse (F11)
blown?
No
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.
Is the fuse (F11) blown
only?
No
Yes
1. The fan motor connector's lead wire is red, whereas is
black.
Measure the resistance between
(+) and (-) of the indoor fan motor
connector. 1,
2. Connect "+" of the tester to fan motor connector's lead
wire, and "-" to lead wire, otherwise the resistance can-
not be measured properly.
2
Is the resistance 1 MΩ
or more?
Replace the fuse (F11) and the
indoor fan motor.
No
Yes
Replace the fuse (F11).
Measure the resistance of cement
resistor (R111) on the indoor elec-
tronic control P.C. board.
Is the resistance approx.
4 Ω?
Replace the indoor electronic control P.C.
board and the indoor fan motor.
No
Yes
Replace the indoor electronic control P.C. board.
31
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 connect-
ing wire?
Is serial signal error indicated 6 minutes later?
Yes
Correct them.
Yes
No
A
Turn OFF the power supply.
Check once more if the indoor/outdoor
connecting wire is not miswiring.
Short-circuit outdoor terminal block S2
1. Miswiring may damage indoor electronic control P.C.
board during the operation.
Be sure to confirm the wiring is correct before the opera-
tion starts.
B
and S3.
1
3. 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.
(Except for outdoor unit of multi system type)
Turn ON the power supply.
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-
Replace the inverter P.C. board or the
outdoor electronic control P.C. board.
2
No
(Lighted
or not
ON quick blinking"?
3
2. Be careful to the residual
voltage of smoothing capacitor.
Yes
lighted)
Turn OFF the power supply.
Remove the short-circuit between out-
door 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>
Yes
Is there any error of the in-
door/outdoor connecting wire,
such as the damage of the
wire, intermediate connection,
poor contact to the terminal
block?
Replace the indoor/out-
door connecting wire.
A
No
Yes
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
No
• Press EMERGENCY OPERATION
switch.
Is there any error of the in-
door/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
No
Is there rated voltage between
indoor terminal block S1 and S2?
<Confirmation of power voltage>
Replace the indoor/out-
Yes door connecting wire.
• Reinstall
No
either the unit
or the light
each other
Yes
away.
Is serial signal
error indicated 6
minutes later?
• Attach a filter
on remote
control receiv-
ing section
of the indoor
unit.
No
Replace the indoor electronic control P.C. board.
Yes
Be sure to release the failure-mode recall function
after checking.
B
32
E Electromagnetic noise enters into TV sets or radios
Is the unit grounded?
Yes
Ground the unit.
No
Is the distance between the antennas
and the indoor unit within 9.91 ft., or is
the distance between the antennas and
the outdoor unit within 9.91 ft.?
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 3.28
ft., or is the distance between the TV
sets or radios and the outdoor unit
within 9.91 ft.?
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
No
Are the antennas damaged?
Is the coaxial cable damaged?
Is there any poor contact in the anten-
na wiring?
Replace or repair the antenna.
Replace or repair the coaxial cable.
Yes
Yes
No
Is the indoor/outdoor connecting wire
of the air conditioner and the wiring of
the antennas close?
Extend the distance between the indoor/outdoor
connecting wire of the air conditioner and the wir-
ing of the antennas.
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, grounding wire, antennas, wiring from antennas, re-
ceiver
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
9-7. TEST POINT DIAGRAM AND VOLTAGE
MSZ-FD09NA MSZ-FD12NA
Indoor electronic control P.C. board
Cement resistor
(R111)
5 VDC
12 VDC
Indoor fan motor
(CN211)
294/325 VDC
(-) Fiducial terminal of
cathode side on measur-
ing high-voltage DC
15 VDC
(+)3 - 6 VDC
(+)0 or 15 VDC
Power supply input
{
208/230 VAC
Room temperature
thermistor RT11
(CN111)
SW P.C. Board
Emergency
operation
Varistor (NR11)
switch (SW1)
CN201
(Used for check of con-
ducting of thermal fuse)
Indoor coil thermistor
RT12, RT13 (CN112)
Horizontal vane (CN1U1)
Vertical vanes (CN151)
Timer short mode
}
point JPG, JPS
(Refer to 7-1.)
Fuse
(F11)
i-see Sensor
(CN110)
(LD101)
-
-
: Connect to the monitor P.C.board
: Connect to the power monitor receiver
Release of Auto restart
function
P.C.board
Room temperature thermistor (RT11)
Indoor coil thermistor (RT12, RT13)
Solder the Jumper wire
JR07
(Refer to 7-3.)
32
50 68 86 104122 140
Temperature (°F)
34
2. Power monitor receiver P.C. board
3. Monitor P.C. board
35
10
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
Slide the sleeve.
Hold the sleeve, and
Pull the terminal while
pushing the locking
pull out the terminal
slowly.
Locking lever
lever.
Connector
MSZ-FD09NA MSZ-FD12NA
OPERATING PROCEDURE
NOTE :Turn OFF power supply before disassembling.
PHOTOS
1. Removing the panel
Photo 1
(1) Hold 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
Screw of the
conduit cover
(1) Remove the panel (refer to 1.) and the corner box.
(2) Remove the screw of the conduit cover. Remove the con-
duit cover and then the indoor/outdoor connecting wire.
(See Photo 2)
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 ground 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.)
Conduit cover
Drain hose
Screws of the
terminal block
cover
(7) Pull out the i-see Sensor from the power monitor receiver
P.C. board holder.
( ) Install the i-see Sensor in its former position when assem-
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
Ground wire to the heat exchanger
(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 ground 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 2)
Screw of the
electrical cover
(15) Remove the terminal block by sliding it.
Sensor holder (inside)
Photo 4
SW P.C. board
Catches of the
electrical box
Holder
Power monitor receiver
P.C. board holder
i-see Sensor
37
OPERATING PROCEDURE
PHOTOS
Photo 5
3. Removing the electrical box
(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 ground wire. (Refer to 2.)
(3) Disconnect the following connectors on the electronic con-
trol P.C. board;
CN211 (Fan motor)
CN112 (Indoor coil thermistor)
CN1U1 (Horizontal vane motor)
CN151 (Vertical vane motor)
(4) Unhook the catches of the electrical box, and pull out the
electrical box. (See Photo 4)
Be sure to assemble the i-see Sensor in
the correct position
4. Removing the nozzle assembly
(1) Remove the panel (refer to 1.) and the corner box.
(2) Remove the conduit cover, and then the indoor/outdoor
connecting wire. (See Photo 2)
(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;
CN1U1 (Horizontal vane motor)
CN151 (Vertical vane motor)
(5) Remove the power monitor receiver P.C. board holder and
the holder. (See Photo 4)
(6) Pull out the drain hose from the nozzle assembly and
remove the nozzle assembly.
Photo 6
5. Removing the vertical vane motor unit
(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. (See
Photo 6)
(6) Remove the vertical vane motor from the vertical vane
motor unit.
Crank of the vertical
vane motor unit
Screw of the vertical
vane motor unit
(7) Disconnect the connector of vertical vane motor from the
vertical vane motor.
Photo 7
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 8
Screws of the horizontal
vane motor unit cover
(3) Remove the screws of the horizontal vane motor unit cover.
(4) Remove the horizontal vane motor from the horizontal vane
motor unit.
(5) 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 9
Motor band
(4) Remove the screws fixing the motor bed. (See Photo 9)
(5) Loosen the screw fixing the line flow fan. (See Photo 10)
(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.
Screws of the
motor bed
(8) Remove the indoor coil thermistor from the heat exchanger.
( ) Install the indoor coil thermistor (RT12) in its former posi-
tion when assembling it. (See to Photo 12)
(9) Remove the screws fixing the left side of the heat exchang-
er. (See Photo 11)
Photo 10
(10) Lift the heat exchanger, and pull out the line flow fan to the
lower-left.
Photo 12
Screw of the line
flow fan
Photo 11
Screws of the
left side of the
heat exchanger
Indoor coil thermistor (RT12)
39
TM
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
Copyright 2008 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in Mar. 2008. No. OBH497 REVISED EDITION-A 7
Distributed in Jan. 2008. No. OBH497 7
Made in Japan
New publication, effective Mar. 2008
Specifications subject to change without notice.
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