The most common reasons why a toilet refuses to flush include a broken, detached, or snapped flush chain connecting the handle lever to the rubber flapper valve, insufficient water volume in the tank due to a misadjusted fill valve float, or a complete blockage in the bowl trapway caused by excessive paper or non-flushable items. 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 flange plunger.
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