Mitsubishi Electric MXZ-2HA40VF-E1 Service Manual page 54

The cooling operation or heating operation does not operate.
Check of R.V. coil
MXZ-2HA40VF/2HA50VF
• The heating operation does not operate.
1. Disconnect the lead wire leading to the compressor.
2. 3 minutes after turning ON the power supply, start EMERGENCY
OPERATION in HEAT mode.
Is there voltage of 220 - 230 - 240 V AC between
pin1 and pin2 at connector CN721?
Yes
Turn OFF the power supply. Disconnect the connector CN721.
Is there normal resistance
to R.V. coil?
(Refer to 12-5.)
Yes
Replace the 4-way valve.
• The cooling operation does not operate.
1. Disconnect the lead wire leading to the compressor.
2. 3 minutes after turning ON the power supply, start EMERGENCY
OPERATION in COOL mode.
Is there voltage of 220 - 230 - 240 V AC between
pin1 and pin2 at connector CN721?
No
Replace the 4-way valve.
OBH828B
No
Replace the R.V. coil.
No
Yes
Replace the inverter P.C. board.
Replace the inverter P.C. board.
54
Connector MXZ-2HA
CN721 Inverter P.C. board