Mitsubishi Electric MSZ-JP12WA-U Service Manual page 22

B Check of remote controller and indoor electronic control P.C. board
*Check if the remote controller is exclusive for this air conditioner.
Press STOP/OPERATE (OFF/ON)
button on the remote controller.
Is LCD display on the remote controller
visible?
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.
Does the unit operate with the remote
controller?
Yes
OK
OBH820A
Replace the batteries. (Refer to 9-1.4.)
No
(Not clear)
Turn ON a radio to AM and press STOP/
OPERATE (OFF/ON) button on the remote
No
controller. *1
Is noise heard from radio?
Yes
Are there any fluorescent lights of
inverter or rapid-start type within the
range of 3.28 ft.(1m)? *2
No
Replace the indoor electronic control
P.C. board. (Including the receiver)
*1 Look at the image of the signal transmitting section of
the remote controller through the monitor of a digital
camera or a camera phone. It is normal if the LED of
the signal transmitting section lights up when the STOP/
OPERATE (OFF/ON) button on the remote control-
ler is pressed. However, it may be difficult to see the
illuminated LED of the signal transmitting section with a
smartphone camera.
*2 If the inverter fluorescent light is turned on when the
room is cool, the unit may have difficulty receiving the
signal from the remote controller or may not be able to
operate with it; if the inverter fluorescent light is turned
on when the room is warm, the unit may be able to
operate with the remote controller.
No
Yes
22
Replace the remote controller.
• Reinstall the unit away from lights.
• Attach a filter on receiving part.