An American Standard Champion toilet that continuously fills with water or cycles periodically is experiencing a stealthy water leak from the tank down into the bowl, typically caused by a compromised 4-inch silicone flush valve seal. When hard water mineral scale or age degrades this sealing gasket, water trickles out of the tank. As the water level drops below the critical threshold, the fill valve automatically opens to replenish it, creating an endless filling cycle that wastes significant water resources.
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