It could be a bad fill valve.to chk this ,open the door and look for the inlet hole from where water comes in.if u see and droplets of water coming down the hole then it is the fill valve.when machine is off the fill should be closed and no water should come in.
other thing could be ,if u have hooked up the drain pipe of the unit directly to the food disposar instead of going through air gap mounted at the sink then some water from the disposar could flow back into the unit.units have chk valve valve built in drain pipe but some times they work 100%.also chk 2 c if water insinde unit is dirty or fresh to confirm above things.
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