What should I do if the main engine of air energy water heater has E3 operation failure?

Single system high voltage switch or double system high voltage switch 1 disconnection protection.

Solution:

1. Before the high pressure is about to be protected, please observe whether the high pressure gauge pressure is rising. If the pressure exceeds 3.0MPa, the high-voltage protection belongs to the normal protection of the host for the following reasons:

1) insufficient or no water flow in the circulating pump;

a； Clean y-type filter b; There is air in the inlet pipe of the circulating pump, and the circulating pump is emptied.

c； D in the process of circulating pump operation; There is not enough water in the water tank, so it needs to be replenished.

e； Circulating pump damaged

2) The temperature probe of the water tank has poor induction, and the water temperature of the water tank is too high, resulting in high pressure.

3) There is a lot of scale in the heat exchanger, please use special cleaning agent to clean it;

4) System abnormality

a； If there is too much refrigerant, remove excess b; The vacuum degree of refrigerant system is not enough, so add refrigerant C again after vacuumizing; Abnormal electron expansion.

The electronic expansion valve is broken or the pipeline is gambling, or the output of the electronic expansion valve on the motherboard is abnormal. Main board problem, first check whether the air environment stability corresponding to panel parameter 06 is correct. If that stability of the air environment is obviously low

If it is the actual temperature, please repair the environmental stability probe.

Second, the high voltage switch is broken (not within the scope of protection).

3. When connecting the high voltage section on the motherboard, the 03E or 07E fault code of the air energy heat pump water heater still appears; (Check whether the high-voltage socket part is connected with multimeter) Replace the wire control first, and then replace the motherboard.