Panasonic WH-MXF09D3E5 Service Manual page 91

Monobloc air-to-water heatpump system

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16.5.23. Four Way Valve Abnormality (F25)

Malfunction Decision Conditions:

1. During heating operation, when the indoor pipe temperature of thermostat ON indoor unit < 0°C.

2. During cooling operation, when the indoor pipe temperature of thermostat ON indoor unit > 45°C.

Malfunction Caused:

1. Faulty sensor.

2. Faulty connector connection.

3. Faulty outdoor unit PCB (noise filter/main).

4. Faulty four way valve.

Abnormality Judgment:

Continue 4 times in 30 minutes.

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