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 there is a lack of refrigerant

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

3 Whether the capillary tube is blocked and whether the water pump and water flow are normal when heating

4 Whether the A2 plug and wiring are reliable

5 Check or replace the A2 temperature sensor, check or replace the control main board