Continuous running occurs when the tiny bypass orifice in the rubber diaphragm assembly gets clogged with sediment or calcium scale. If water cannot refill the upper chamber, the valve cannot create the pressure needed to close.
Tripping the flush handle releases pressure in the upper relief chamber, allowing supply line pressure beneath the diaphragm to lift the main valve seat. As water trickles through the bypass hole to refill the chamber, it pushes the diaphragm back down onto its seat.
The rubber vacuum breaker sleeve inside the chrome tube acts as a one-way check valve to prevent back-siphonage into potable water lines. When the rubber degrades or hardens, water squirts out during the flush cycle.
Heavy commercial wall-hung toilets rely on in-wall iron carrier brackets. Over millions of uses, carrier mounting nuts can loosen, causing the porcelain to tilt and crushing the neoprene felt gasket between bowl and waste pipe.
Flushometers require a minimum one-inch water supply pipe and at least 25 to 35 PSI of flowing water pressure. They deliver high-volume water over a short duration, which smaller residential half-inch lines cannot support.
Plumbers test sensor batteries or transformer power supplies, clean the infrared optic lens, inspect the override solenoid plunger, and rebuild the internal diaphragm to restore reliable automatic hands-free operation.
Yes. Even microscopic mineral grains or pipe scale lodged in the bypass hole will prevent the upper chamber from equalizing, causing either continuous running or a short, weak flush that fails to clear commercial bowls.
Technicians isolate the control stop, remove the chrome caps with non-marring wrenches, clean the interior brass body, drop in a genuine manufacturer diaphragm kit, replace the handle seal, and adjust the flow stop.
Upgrading commercial flushometers from older 3.5 GPF assemblies to modern 1.28 or 1.6 GPF dual-filtered diaphragms reduces facility municipal water consumption by tens of thousands of gallons annually while lowering utility overhead.
Fast Service for Commercial Toilet & Flushometer Repair
Technicians carry commercial replacement components to diagnose and complete repairs on the first visit.
