Cause 1: There is a problem with the sensor (unlikely, most manufacturers test before leaving the factory)
Cause 2: The sensor is not not installed correctly, I don't know what type of sensor you are using. Generally, there are more sensors installed at the exhaust port. If the installer places too many sensors in the water tank, the sensor will be tilted in the water tank with a large slope. , your display should indicate that the water level is full, the solution is to loosen the signal wire retaining board from the exhaust port with a Phillips screwdriver and gently pull the signal wire outward . The signal wire part is covered with waterproof black rubber. , which can be blocked. You can push it in first and then pull it out.
If the signal line is not in the upper exhaust position, it is recommended to findan installer for repair, because sensors located in other locations require high installation accuracy. You can also contact me and I will try my. the best thing is to help!