Mitsubishi Electric MXZ-2D33VA Service Manual page 152

• When the operation frequency does not go up from lowest frequency.
Check of HPS
MXZ-3D54VA2- , ,
E3 ER3
MXZ-3D68VA/4D72VA/4D83VA/5D102VA/6D122VA
1. Disconnect the connector CN681/CN63H.
2. Check the resistance of HPS 1 minute after the outdoor unit breaker was turned OFF.
Check the resistance between
each terminal.
Reconnect CN681.
Turn ON the power supply to the indoor and the outdoor units.
3 minutes later, start EMERGENCY OPERATION.
Is HPS protection displayed
immediately after compressor
starts?
No
Normal
OBH626K
ET3
Infinity
Yes
Replace the outdoor control P.C. board.
CN681
CN63H
Replace HPS.
152
MXZ-3D54VA2- , ,
E3 ER3 ET3
MXZ-3D68VA/4D72VA/4D83VA/5D102VA
Outdoor control P.C. board
MXZ-6D122VA
Outdoor control P.C. board