Panasonic WH-MXF09D3E5 Service Manual page 81

Monobloc air-to-water heatpump system

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16.5.13. Outdoor High Pressure Protection (H98)

Malfunction Decision Conditions:

During operation of heating, when pressure 4.0 MPa and above is detected by outdoor high pressure sensor.

Malfunction Caused:

1. Faulty water pump.

2. Insufficient water flow rate in system.

3. Water leak in system.

4. 2/3 way closed.

5. Clogged expansion valve or strainer.

6. Excessive refrigerant.

7. Faulty outdoor high pressure sensor.

8. Faulty outdoor unit PCB (main).

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