Which of the following is NOT a problem associated with flush valves (flushometers)?

The choice indicating that the valve won't turn on is not considered a problem associated with flush valves, or flushometers. This is because if a flush valve does not turn on, it signifies a lack of functioning or activation rather than a typical issue experienced while operating the valve. The function of a flush valve involves controlled mechanisms, and its failure to turn on is not a general operational challenge but rather an indication of a larger malfunction or power issue, which is outside the scope of common operational problems.

In contrast, the other options are regular issues that can occur during the use of flush valves. A valve that won't flush indicates that it may be clogged or damaged, impacting its ability to function properly. A noisy flush is often linked with issues related to water pressure or components within the flush mechanism that can create unwanted sound during operation. A valve that flushes too long suggests there might be a malfunction in the timing mechanism, leading to excessive water discharge. These problems can typically be addressed through repairs or adjustments, making them relevant concerns for those using flush valves.