Panasonic WH-MXF09D3E8 Service Manual page 84
Mono bloc air-to-water heatpump system
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Also See for WH-MXF09D3E8:
- Service manual (125 pages) ,
- Operating instructions manual (76 pages) ,
- Design handbook (132 pages)
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16.5.15 Outdoor High Pressure Switch Activate (F12)
Malfunction Decision Conditions:
During operation of cooling and 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.
84
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