Common problems with toilet fill valves include getting stuck in the open position (causing continuous overflowing), developing a high-pitched whistling or squealing noise during refills, leaking water continuously into the overflow tube, or failing to shut off completely due to mineral scale and worn-out rubber diaphragms. These issues waste thousands of gallons of water and create disruptive household plumbing noises. Verification: Monitor the tank during a refill cycle to ensure the fill valve shuts off cleanly and quietly.
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