Check Of Remote Controller And Receiver P.c. Board - Mitsubishi Electric MFZ-KA25VA 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 the LCD display on the the
remote controller visible?
Yes
Remove the batteries, then set them back
and press RESET button. (Refer to 10-1.4.)
Check if the unit operates with the remote
controller.
Does the unit operate with the
remote controller?
Yes
OK
No
Replace the batteries. (Refer to 10-1.4.)
(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 of rapid-start type within
the range of 1m?
Replace the indoor electronic
control P.C. board.
No
Yes
Yes
29
Replace the remote controller.
Reinstall the unit away from lights.
Attach a filter on receiving part.