Valve does not function. Control stop or main valve is closed. Open control stop or main valve. Insufficient volume of water to adequately siphon fixture. If no gauges are available to properly measure supply pressure or volume of water at the Valve, then completely remove the entire Diaphragm Assembly and open the control stop to allow water to pass through the empty valve.
Valve closes off immediately.
Install inside parts kit to correct above problem and update the Flushometer Valve. The size of the orifice in the by-pass is of the utmost importance for the proper metering of water into the upper chamber of the valve. Do not enlarge or damage this orifice. Water splashes out of fixture. If the fixture proves to be noisy, it should be replaced by a quiet action fixture.