|Pump is cycling off and on
||Pilot screen is stopped up
||Clean screen (2003 or older models)
|Pressure switch is not set correctly
||Cut off pressure must be at least 10 psi higher than valve set pressure.
|Valve is not set correctly
||Reset valve to at least 10 PSI lower than cut off pressure
|Debri between diaphragm and seat
||Clean out valve
|Waterlogged pressure tank
|Bad or torn diaphragm in main valve or pilot valve
||Replace damaged diaphragm
|Pressure modulates 10-15 PSI from set pressure
||Air trapped in mainline-usually occurs on new start ups and spring start ups.
||Release air from main line and reset CSV if necessary
||Valve is not set correctly
|Check colored (red on 2", orange on 3" and larger) restriction fitting on pilot for enlarged, missing, or wrong color orifice.
||Replace worn orifice or get correct colored orifice.
|Demand is more than pump can provide at desired pressure
||Reduce demand so it is within pump capabilities to maintain desired pressure.
||Pressure tank is located too far away from the valve
||Relocate valve or tank to bring them closer together or add a second smaller tank to the system close to the valve.
|Too much air pressure in tank
||Reduce air pressure in tank to 5-10 PSI below cut in pressure.
|Worn or defective diaphragm
|Pump rapid cycles at start up and then begins to function correctly
||Pressure switch is located on the main line.
||Move pressure switch to a small line at the base of the tank on a line no larger than 1 1/4" in diameter
|CSV setting is too close to cut off pressure
||Set pressure switch cut off pressure at least 10 PSI higher than CSV setting
|Air pressure in tank too high
||Reduce air pressure in tank to 5-10 PSI below cut in pressure
|Multiple check valves in system working against each other
||Remove all but the check valve or foot valve on the pump itself
|Cut in pressure is not the same as CSV set pressure
||Set pressure switch to come on at the same pressure the CSV is set to hold
|Air trapped in cover or bonnet
||Loosen copper fitting on cover to release trapped air
|More than 125 psi differential between inlet and outlet pressure of valve
||Reduce differential pressure or add a second valve