A toilet typically stops flushing due to one of three main mechanical or plumbing failures: a broken or disconnected flush chain inside the tank that prevents the flapper from opening when the handle is pressed; insufficient water volume in the tank because the fill valve float is set too low; or a physical obstruction or clog in the bowl trapway blocking the water and waste from exiting. Callout type="warning" title="Hygiene Warning": Wear rubber gloves when inspecting internal tank components or unclogging bowls. Verification: Remove the tank lid to check the chain and water level, or test the bowl with a plunger.
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