Check the pressure switch . its circluar in shape with 6/8 wires attached, and a small nipple with a 10mm pipe attached. as the water rises in the drum air is pushed up thru this pipe which when working ok , eventually pushes against a switch .hence its name. so, if there is damage to this pipe( maybe rubbing against the drum) the passage of air escapes before reaching the switch. if the pipe is ok then check the switch by blowing up the pipe (with the power off ) and u should hear a small click inside the switch. if not replace
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Bad water pressure switch or bad water inlet valve? does it have or leak water in the tub when not in use? ( inlet valve) sometimes the pressure switch tube has a hole or blockage in it and will not have the pressure needed to open diaphram and go into wash cycle and it may overflow
If the washer is overflowing the pressure switch might be defective. The pressure switch is attached to a small tube which is attached to the outer wash tub. As the water level rises the air pressure in the tube increases, once the set water level is reached the pressure switch turns off power to the water inlet valve. Check to be sure the air tube to the pressure switch is clear before replacing the switch.
If the pressure switch is fine, check the water inlet valve for continuity on the solenoid coil by removing the top cover of the machine.
Usually this is caused by the water inlet valve sticking in the open position. If you can catch the washer while it's overflowing, unplug the washer. If the water stops, then the problem is most likely a pressure switch or pressure hose. If the water does not stop, it is most likely the water inlet valve.
Your pressure switch stops the water and allows it to start the next cycle. It's a switch either in the control panel or at the top of the tub with a small tube connected to it which goes down between the inner and outer tub. As the water level increases the air in the tube is compressed until there is enough pressure to make the switch stopping the water from filling. This tube can get clogged and the switch won't work. Remove the tube and clean it out. Blowing on the tube when it's still connected to the switch will make the switch if it's working and clear.
Water inlet valve
If it fills with water and starts the cycle and the water keeps running in then your water inlet valve on the back where the water supply comes in is sticking. It needs replacing.
The first thing that needs to be done is to disconnect the fill hoses from the back of the machine. Once disconnected, look at the inlet valve screens and check for blockage, if clear, open the water valves and check for water flow through hoses, if not clear, clean screens at fill valve, reconnect hoses & check for operation. If the problem remains, then the problem is with the machines fill valve & it would need to be replaced
If the water comes out when filling, check your water valve by unplugging the washer when it is filling. If the water still runs, replace the valve. If the water stops, check the small tube that goes from the water pressure switch (in the consul) to the bottom of the tub. This must be connected without any holes or obstructions. If this is ok, replace the water pressure switch.