| Symptom | Cause | Remedy |
| Pump is cycling off and on |
Disc is worn out |
This is usually due to differential pressure being higher than 125 PSI. Use a second valve to reduce differential pressure to original valve. Replace disc in original valve. |
| Pressure switch or valve not set correctly |
Cut off pressure must be higher than valve pressure. Reset pressure switch or valve. |
| Waterlogged pressure tank |
Replace tank |
| Bad or torn diaphragm |
Replace pilot diaphragm |
| Low Pressure |
Valve is not set correctly |
Reset valve |
| Demand is more than pump can provide at desired pressure |
Reduce demand so it is within pump capabilities to maintain desired pressure. |
| Chattering valve |
Too much air pressure in tank |
Reduce air pressure in tank to 12-15 PSI below cut in pressure. |
| Pump rapid cycles at start up and then begins to function correctly |
Pressure switch is located on the main line or closer to the main line than the pressure tank. |
Move pressure switch to 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 12-15 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 |
