Mitsubishi Electric MXZ-2D33VA-E1 Service Manual page 89

• When the operation frequency does not go up from lowest frequency.
Check of HPS
MXZ-3D68VA/4D72VA/4D83VA/5D102VA
1. Disconnect the connector CN681.
2. Check the resistance of HPS 1 minute after the outdoor unit breaker was turned OFF.
Check the resistance between
each terminal.
0Ω
Reconnect CN681.
Turn ON the breaker to the indoor and the outdoor units.
3 minutes later, start EMERGENCY OPERATION.
Is HPS protection displayed
immediately after compressor
starts?
No
Normal
OBH626B
Infinity
Replace HPS.
Yes
Replace the outdoor control P.C. board.
89
MXZ-3D68VA/4D72VA/4D83VA/5D102VA
CN681 Outdoor control P.C. board