The water level sensor is damaged or faulty, which makes it impossible to accurately detect the water level.
The water flow in the water tank is too small, which may be caused by insufficient water pressure or blocked water pipes.
Scaling on the inner wall of the water tank or excessive water injection causes large fluctuation of water level, which affects the normal operation of the sensor.
In view of the above problems, users are advised to pay attention to the following points:
Turn off the power supply: When "AD" appears, in order to ensure safety, please turn off the power supply of the gas water heater first and cut off the natural gas supply.
2. Cleaning the fault point: First, check whether the water level sensor is covered with dirt, water stains, oil stains and other substances. If yes, please clean it carefully and check whether the sensor connection cable is plugged in firmly.
Maintenance: "AD" fault is a professional mechanical fault. If the above methods can't solve the problem, it is recommended to contact professional and technical personnel for handling.
Preventive measures: regularly maintain the water heater and clean the water tank to prevent scaling and impurities. When installing and using the gas water heater, please use fire and ignition correctly according to the operating instructions, maintain a good ventilation environment, and pay attention to prevent the impact of external forces and other factors.