| 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 |
Replace 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 |
| Low Pressure |
Valve is not set correctly |
Reset valve |
| 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. |
| Chattering valve |
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 |
Replace 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 |
