If your Kohler toilet tank is not filling up with water at all, the issue is usually caused by a fully closed or broken water supply shutoff valve, a severely clogged fill valve filter screen, a stuck float mechanism, or a disconnected water supply line. Additionally, if the fill valve assembly is jammed internally, it will fail to open and let water enter the tank. Callout type="warning" title="Hygiene Warning": Wear rubber gloves when inspecting internal tank components. Verification: Check that the wall shutoff valve is open and observe whether water enters the tank when lifting the float manually.
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