Problem: Length of flush is too long (long flush) or fails to shut off.
Cause: Bypass hole (upper filter ring) of diaphragm assembly is dirty.
Solution: Remove the diaphragm assembly. disassemble the filter rings from the diaphragm, wash under running water, and reassemble. Replace as necessary.
Cause: Relief valve or diaphragm assembly is damaged.
Solution: Replace relief valve or diaphragm assembly.
Cause: Water saver/conventional diaphragm assembly is installed on low consumption fixture or closet diaphragm assembly is installed on urinal fixture.
Solution: Determine the required flush volume (see label on valve or markings on fixture). Replace diaphragm assembly or relief valve for appropriate flush volume of fixture.
Cause: Inside cover is damaged.
Solution: Install new inside cover.
Cause: Line water pressure dropped and is insufficient to close valve.
Solution: Close the control stop until pressure is restored.
Cause: Relief valve is not seated properly.
Solution: Disassemble diaphragm components (relief valve, filter rings, and diaphragm unit), wash under running water, and reassemble. Replace as necessary.