Mitsubishi Electric MUZ-GA50VA-E1 Service Manual page 36

11-6. TROUBLESHOOTING FLOW
Outdoor unit does not operate.
Check of power supply
Check the connecting of parts of main power supply circuit.
Turn ON power supply.
Is there voltage of 230 VAC in the
power supply terminal block?
Yes
Is the output voltage from the noise
filter P.C. board 230 VAC?
Yes
Is the input voltage to the power board
230 VAC?
Yes
Is the input voltage to the outdoor
electronic control P.C. board 325 VDC?
Yes
Replace the outdoor electronic control
P.C. board.
No
Check the power supply cable.
No
Is fuse (F64) blown?
Yes
Replace the fuse.
No
Replace the reactor.
No
Replace the power board.
36
Replace the noise
No
filter P.C. board.