What indicates that the toilet flush valve has failed?

A failed toilet flush valve typically leads to the toilet not functioning properly, which can include a failure to reset automatically after a flush. When the flush valve does not reset, it can cause water to continuously run or not adequately flush. This means that users might notice that the water is either not draining or the tank is taking longer than normal to refill, indicating a malfunction in this critical component.

The other conditions listed, while related to toilet issues, point towards different problems. An overflowing toilet is usually related to issues in the overall plumbing or drain lines rather than the flush valve specifically. A stuck flush button may indicate mechanical malfunction or user error, and a closed toilet lid has no relevance to the operation of the flush valve. Thus, identifying that the flush valve doesn’t reset automatically is a clear indication of its failure.