Easy fix, no parts needed! The small hose that comes from the bottom of the tub up to the water level switch is supposed to be air tight. As the water rises in the tub the pressure builds in that small tube.
The pressure in the tubing shuts down the switch. So what goes wrong? Sediment builds up in the tubing OR a hole gets in the tubing OR vibration simply makes the tubing fall off the switch. Blow out the sediment (use them lungs). Reattach the tubing , pump out the water so that the pressure can build in the tubing once more and retry. The possibility of the switch itself being bad is slim.
If you need further help, reach me via phone at
https://www.6ya.com/expert/dan_73bbd84fe1d95b61
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