What to do if the E4 exhaust temperature is too high protection appears in the household air-energy water heater

●Fault analysis of household air-energy water heater E4

What should I do if the E4 exhaust temperature is too high protection appears in the after-sales service of the household air-energy water heater? Next, let's analyze the main causes of the failure.

1. Fluorine leakage in the system

The refrigeration system usually leaks fluorine only after there is leakage of electricity. If you only add refrigerant, the fault will reappear after a period of time. When the refrigerant leaks, the system pressure is low, the suction superheat is large, the suction temperature is high, and the exhaust temperature is high.

2. The exhaust temperature sensor has an abnormal resistance or is not connected properly, causing the temperature detected by the mainboard to be higher than the actual temperature. When the protection temperature is reached, the control reports exhaust protection.

3. The electronic expansion valve is stuck, causing the refrigerant to be unable to return to the compressor in time, causing the compressor to overheat.

4. The water tank temperature sensor is not well fitted, and the detected water temperature is too low, resulting in the machine not shutting down even when the maximum set temperature is reached.

5. After maintenance, an E4 fault is reported. This may be due to insufficient vacuuming, inaccurate or insufficient refrigerant refilling, or welding of the pipeline leading to welding blockage.