What is done after closing the toilet lid when the flush valve fails to reset?

When the flush valve fails to reset after closing the toilet lid, pulling the manual shut-off handle located at the base of the toilet is the appropriate action to take. This handle is designed to stop the flow of water to the toilet, which can help manage the situation until further repairs can be made. This immediate response can prevent potential flooding or other water-related issues that might arise from a malfunctioning flush valve.

The other actions, while relevant in different contexts, do not directly address the needs of the situation as effectively. Notifying engineering staff is important, but it should occur after securing the toilet to avoid immediate overflow. Checking for blockage could be useful in some cases, but if the flush valve itself is malfunctioning, it may not resolve the issue. Waiting for assistance from another crew member does not provide a timely solution to the immediate problem, which can lead to further complications. Thus, engaging the manual shut-off handle is the most direct and effective response in this scenario.