If a water supply valve is turned completely off but water continues flowing into an appliance or plumbing fixture, it typically indicates that the valve's internal rubber washer, gate, or ball mechanism is severely worn, damaged, or obstructed by mineral scale, preventing it from forming a tight seal. In the case of electronic solenoid inlet valves on dishwashers, water may continue trickling if mineral debris jams the internal rubber diaphragm open. To stop the flow immediately, shut off the main household water supply shut-off valve to the entire house.
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