Mitsubishi Electric MSZ-FD25VA Service Manual page 29

Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller.
Check of remote controller and indoor electronic control P.C. board
B
wCheck 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 con-
troller 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
OPERATE/STOP(ON/OFF) button on the remote controller.
Is noise heard from radio?
Are there any fluorescent lights of
inverter or rapid-start type within
the range of 1 m?
Replace the indoor electronic
control P.C. board.
(including the receiver)
No
Yes
Yes
No
29
Replace the remote controller.
Reinstall the unit away from lights.
Attach a filter on receiving part.