If the water rises abnormally or threatens to overflow, stop using the machine and shut off the supply from a safe point. The first goal is to stop the incoming water, not restart the cycle.
Contain the water without exposing yourself to wet connections
If you can do so safely, shut off the supply valves. Cut the power from a dry location; do not reach for an outlet surrounded by water. Do not force the door open or remove the filter plug with the drum full.
Describe what you have already observed: whether the level kept rising after the appliance was turned off, whether foam appeared, and at what stage it began. Do not keep the water running to recreate a flood.
What each observation means
- Water entering while idle: you need to distinguish valve closure from external backflow. See filling with the machine turned off.
- Build-up while the control is calling for water: the water level detection circuit, as well as the inlet control, may be involved.
- Foam filling the glass: does not necessarily equal the same volume of water. Detergent and the wash program should be part of the record.
The normal level depends on the machine design, program, and load. An additional fill that is expected does not prove overfilling either; what is concerning is a rise that is not controlled or exceeds the documented limits.
The technician should check both the closing of the solenoid valve and the system signals. Adjusting pressure switch screws or blowing into electronic sensors can alter or damage components.
If you cannot stop the supply or the water reaches electrical installations, move away from the area and request emergency assistance appropriate to the situation.