Panasonic WH-MHF12G9E8 Service Manual page 106
(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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16.5.18 Outdoor High Pressure Switch Activate (F12)
Malfunction Decision Conditions:
During operation of heating, when pressure 4.5MPa and above is detected by outdoor high pressure switch.
Malfunction Caused:
1
Dust accumulation on the outdoor unit heat exchanger.
2
Air short circuit at outdoor unit.
3
Faulty water pump.
4
Insufficient water flow rate in system.
5
Water leak in system.
6
2/3 way valve closed.
7
Clogged expansion valve or strainer.
8
Excessive refrigerant.
9
Faulty outdoor high pressure sensor and switch.
10 Faulty outdoor unit PCB.
Abnormality Judgment:
Continue 4 times in 20 minutes.
106
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