Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 269

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
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 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)
Turn ON a radio to AM and press
No
OPERATE/STOP(ON/OFF) button on
the remote controller.
Is noise heard from radio?
Yes
Are there any fluorescent lights of
inverter or rapid-start type within
the range of 1m?
No
Replace the indoor electronic
control P.C. board.
(including the receiver)
Resolución de averías
No
Replace the remote controller.
Yes
● Reinstall the unit away from lights.
● Attach a filter on receiving part.
269