Washing machine water electromagnetic valve constantly into the water is how to return a responsibility?

Washing machine water electromagnetic valve constantly into the water is how to return a responsibility? The solenoid valve in the washing machine after open washing machine, guangzhou daily marketing time soon found that the water inflow to achieve rated level, but the strange thing is water electromagnetic valve is still constantly into the water, what's going on? Washing machine has this kind of situation is usually caused by damage of water pressure switch, users can blow air pressure method of judgment. Is power off, remove the water level switch, through tracheal blowing into a pressure switch back, with a multimeter to measure water level switch resistance between the two lugs, blowing air resistance should be tending to zero, do not blow air resistance should be greater than k Ω. If the measured resistance is always very big, and couldn't hear the water level switch inside the action of the contact, which showed that the water pressure switch to malfunction. After replacement of water pressure switch, the fault can be ruled out. Preferably professional processing, please.