Panasonic WH-MHF12G9E8 Service Manual page 94
(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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16.5.6 Compressor Low Pressure Protection (H42)
Malfunction Decision Conditions:
During operation of heating and after 5 minutes compressor ON, when outdoor pipe temperature below -29°C or
above 26°C is detected by the outdoor pipe temperature sensor.
Malfunction Caused:
1
Dust accumulation on the outdoor unit heat exchanger.
2
Air short circuit at outdoor unit.
3
2 way valve partially closed.
4
Faulty outdoor unit fan motor.
5
Refrigerant shortage (refrigerant leakage).
6
Clogged expansion valve or strainer.
7
Faulty outdoor pipe temperature sensor.
8
Faulty outdoor unit main PCB (main).
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