Check Of Remote Controller And Indoor Electronic Control P.c. Board - Mitsubishi Electric MSZ-FT25VG-E1 Service Manual

B Check of remote controller and indoor electronic control P.C. board
Check if the remote controller is exclusive for this air conditioner.
Press OFF/ON (stop/operate) 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 10-1.4.)
Check if the unit operates with the remote
controller.
Does the unit operate with the remote
controller?
No
Turn ON a radio to AM and press OFF/
ON (stop/operate) button on the remote
controller. 1
Is noise heard from radio?
Yes
Are there any fluorescent lights of
inverter or rapid-start type within the
range of 1 m? 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 OPERATE/STOP (ON/OFF) button on the remote controller 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.
OBH864
Replace the batteries. (Refer to 10-1.4.)
No
(Not clear)
OK
Yes
Replace the remote controller.
No
• Reinstall the unit away from lights.
Yes • Attach a filter on receiving part.
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