Mitsubishi Electronics Mitsubishi Digital Electronics Air Conditioner Msz Fd09na User Manual

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-FDNA 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 lter  
Air inlet  
Remote controller  
Platinum deodorizing lter  
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 xing 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)  
Airow  
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 nish  
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.  
Airow  
(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 modication  
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 ow  
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 airow 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 oor 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 ow 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.  
Conrm 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 conrm 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 conrm 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 ash every Room temperature  
Refer to the characteristics of the room temperature  
thermistor (9-7.).  
0.5-second  
thermistor  
2-time ash  
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 ash  
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 ash  
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 ash  
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  
ashing 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 ash 14-time ash  
6-time ash  
Cause:  
Flash on and  
2-time ash  
3-time ash 4-time ash 5-time ash  
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 ashes.  
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 ashes.  
2-time ash  
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 ashes.  
3-time ash  
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 ashes.  
4-time ash  
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 ashes.  
5-time ash  
• 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 ashes.  
6-time ash  
• 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 ashes.  
7-time ash  
• 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 ashes.  
14-time ash  
• Check the stop valve.  
Other ab-  
normality  
An abnormality other than above mentioned  
is detected.  
• Conrm 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 ash.  
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 rst 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 ow 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 ow 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 uorescent lights of  
inverter or rapid-start type within the  
range of 3.28 ft.?  
•Reinstall the unit away from lights.  
•Attach a lter 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? <Conrmation 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 conrm 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? <Conrmation 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?  
<Conrmation 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 lter  
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 fullled, the electromagnetic noise may enter, depending on the electric eld strength  
or the installation condition (combination of specic 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 eld intensity of the broadcast station affected by the electromagnetic noise  
6. Presence or absence of amplier 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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