Pump is cycling off and on |
Diaphragm 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 diaphragm in original valve. |
Pressure switch or valve not set correctly |
Cut off pressure must be higher than valve pressure. Reset pressure switch cut 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 5-10 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 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. |