Check Of Power Supply; Troubleshooting - Mitsubishi Electric MXZ-2B20NA Service Manual

11-6. TROUBLESHOOTING FLOW
MXZ-2B20NA MXZ-3B24NA MXZ-3B30NA MXZ-4B36NA
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 208/230 V AC in the
power supply terminal block?
Yes
Is the output voltage from the noise
filter P.C. board 208/230 V AC?
Yes
Is the input voltage to the power board
208/230 V AC?
Yes
Is the input voltage to the electronic control
P.C. board 294/325 V DC?
Yes
Replace the electronic control
P.C. board.
MXZ-5B42NA
Check the main power supply circuit for proper connections.
Turn ON the power supply.
Is there voltage of 208/230V AC in the
power supply terminal block?
Yes
Is the output voltage from the outdoor
power P.C. board 294/325V DC?
No
Turn OFF the power supply and recconnect the reactor
Is the reactor short-circuited?
Yes
Replace the outdoor power P.C. board.
OBH560G
No
Check the power supply cable.
Replace the noise
No
filter P.C. board.
No
Replace the reactor.
No
Replace the power board.
No
Check the power supply cable.
Yes
Replace the outdoor control P.C. board.
No
Replace the reactor.
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