Check Of Remote Controller And Receiver P.c. Board - Mitsubishi Electric MSZ-FA25VA Service Manual

Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller.

Check of remote controller and receiver P.C. board

B
wCheck if the remote controller is exclusive for this air conditioner.
Switch ON the remote controller.
Is LCD display on the 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
No
Replace the batteries. (Refer to 9-1.4.)
(not clear)
No
Turn ON a radio to AM and press switch
ON the remote controller.
Is noise heard from radio?
Are there any fluorescent lights of
inverter or rapid-start type within
the range of 1m?
Replace the indoor electronic
control P.C. board.
No
Yes
Yes
No
22
Replace the remote controller.
Reinstall the unit away from lights.
Attach a filter on receiving part.