TROUBLESHOOTING
110
PP - Hb
↓
Water side exchanger water inlet/outlet
temperature sensor is loose (1)
YES
→
Ensure the temperature sensor is connected
properly
NO
↓
Water side heat exchanger water inlet/outlet
temperature sensor has short-circuited or failed (2)
YES
→
Replace the temperature sensor
NO
↓
4-way valve is blocked or damaged (3)
YES →
Replace 4-way valve
NO
↓
Replace main PCB
Notes:
1 |t1|Water side electric exchanger water inlet temperature sensor and water side exchanger water outlet
temperature sensor connection is port CN6 on the main PCB.
2 |t1|Measure sensor resistance. If the resistance is too low, the sensor has short-circuited. If the resistance is
not consistent with the sensor’s resistance characteristics table, the sensor has failed.
3 |t1|Restart the unit in cooling mode to change the refrigerant flow direction. If the unit does not operate
normally, the 4-way valve is blocked or damaged.
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