Mitsubishi Electric MXZ-2B20NA Service Manual page 24

11-6. TROUBLESHOOTING FLOW
MXZ-2B20NA MXZ-2B20NA -
Outdoor unit does not operate.
Check of power supply
Check the connecting of parts of main power supply circuit.
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 outdoor
electronic control P.C. board 294/325 V DC?
Yes
Replace the outdoor electronic control
P.C. board.
1
No
Check the power supply cable.
Replace the noise
No
filter P.C. board.
No
Replace the reactor.
No
Replace the power board.
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