Panasonic WH-MHF12G9E8 Service Manual page 91
(mono bloc) air-to-water heat pump system
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Also See for WH-MHF12G9E8:
- Planning and installation manual (117 pages) ,
- Operating instructions manual (100 pages)
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16.5.3 Water Pump Abnormality (H20)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the rotation speed detected by the IPM of water pump motor
during water pump operation is used to determine abnormal water pump (feedback of rotation > 6,000rpm or <
1,000rpm).
Malfunction Caused:
1
Operation stop due to short circuit inside the water pump motor winding.
2
Operation stop due to breaking of wire inside the water pump motor.
3
Operation stop due to breaking of water pump lead wires.
4
Operation stop due to water pump motor IPM malfunction.
5
Operation error due to faulty indoor unit PCB.
Abnormality Judgment:
Continue for 5 seconds.
91
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