Fault action

1 Display fault

2 Stop all outputs except water pump

Fault handling

1 Check whether the condenser ventilation and heat dissipation are good and whether the compressor is working normally

2 Whether the ambient temperature is higher than 43℃ when cooling and higher than 24℃ when heating

3 Whether there is a lack of refrigerant, whether the water pump and water flow are normal, and whether the expansion valve is normal

4 Whether the T5 plug and wiring are reliable

5 Check or replace the T5 temperature sensor, check or replace the control main board