Mitsubishi Electric MXZ-3E54VA-E1 Service Manual page 93

11-6. TROUBLESHOOTING FLOW
Outdoor unit does not operate.
Check of power supply
Check the main power supply circuit for proper connections.
Turn ON the power supply.
Is there voltage of 230 V AC in the
power supply terminal block?
Yes
Is the output voltage from the outdoor
power P.C. board 325 V DC?
No
Turn OFF the power supply and recconnect the reactor.
Is the reactor short-circuited?
Yes
Replace the outdoor power P.C. board.
OBH723D
No
Check the power supply cable.
Yes
Replace the outdoor control P.C. board.
No
Replace the reactor.
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