Troubleshooting method:
1. Check whether the joint of the water level sensor is damp.
2. The water level sensor connection is not in good contact with the socket on the computer board, it is recommended to adjust and re-plug.
3. The water level sensor plug is in poor contact with the water level sensor cable. You are advised to adjust and reinsert the plug.
4, the computer board detection circuit fault, it is recommended to repair or replace the computer board.
5. The water level sensor is faulty. It is recommended to replace the water level sensor.
6, it is recommended to contact professionals for maintenance.