1, the connecting wire of water temperature sensor falls off.
Solution: first observe whether the connection of the water temperature sensor falls off. If so, it is necessary to check the connection and weld. If not, friends should not weld themselves. It's best to hire professionals.
2, water temperature sensor failure
Solution: The water temperature sensor is broken. If the sensor cannot correctly convey the water temperature, an e3 error will occur. Just replace the water temperature sensor.
3. Circuit board failure
Solution: The circuit board failure causes the water temperature sensor to have no power supply, and there may be many other problems. Generally, the above two kinds of faults have not been solved, that is, the circuit board fault, and the circuit board can be replaced.
Extended data:
1, clean appearance.
There will be dust and oil on the surface of the wall-hung boiler, so it is necessary to clean the shell of the wall-hung boiler. You can use a towel or brush when cleaning, and you can add a dust cover on the wall-hung boiler to prevent dust accumulation. Wall-hung boilers are generally placed in the kitchen, and the daily cleaning of the surface is more important.
2, reduce the scale hazard
Scale will greatly affect the thermal efficiency of wall-hung boilers. When the hardness of domestic water is relatively high, it is easy to produce scale and shorten the life of wall-hung boiler. In order to avoid the scale problem as much as possible, it is suggested to choose the plate wall-hung boiler. When using water, the water temperature should not exceed 65℃, because high temperature is easy to scale. If the water quality is hard, a water softener can be installed to soften the water quality and reduce the scale.