Water Pump - Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook

[8-9 Troubleshooting Problems with Major Components on Hydro unit ]
8-9-4

Water Pump

Check the connector and make sure that it is connected properly.
If the supply voltages are correct, and the control signal is being sent and the pump will still not operate the likely causes are:
Coil failure - replace pump. If the windings have been damaged the pump will require replacing.
Internal mechanical failure such as bearing failure, turbine failure, magnet degradation. This will require pump replacement.
Before replacement the causes must be investigated and resolved. The pump shaft bearings and magnets can be easily dam-
aged by overheating due to dry running or water system blockage. Check the strainer for blockage, investigate the water circuit
for blockage and or foreign material, and that there is no air in the system or an uncontrolled leak.
INV-BOARD
SC-W
SC-V
SC-U
BS_08_E
Black
CT-2
White
Red
CT-1
W
Pump
V
U
39
chapter 8 -