E09 No effect protection
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