Mitsubishi Electric MCFH-GA35VB Service Manual page 16

The unit does not operate with the remote controller.
Also, the OPERATION INDICATOR lamp doesn't light up by pressing the EMERGENCY OPERATION switch.
Check of indoor electronic control P.C. board
C
Check both "parts side"and "pattern
side" of indoor electronic control P.C.
board visually.
When OPERATION INDICATOR lamp flashes 4 - time.
Indoor unit does not operate.
Check of indoor electronic control P.C. board
D
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Replace the fuse.
Yes
Is fuse(F11)blown?
No
Is varistor(NR11)burnt?
Yes
Replace the varistor.
Turn off the power supply.
Replace the indoor electronic
control P.C. board.
16
Trouble of the indoor electronic
control P.C. board.
No