Symptom
Cause
Diaphragm is worn out
Remedy
This is usually due to differential
pressure being higher than 125 PSI.
Use a second valve to reduce differen-
tial pressure to original valve. Replace
diaphragm in original valve.
Pump is Cycling off and on
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 work-
ing against each other
Remove all but the check valve or foot
valve on the pump itself
CSV1A Troubleshooting
Pressure switch or valve not set
correctly
Cut off pressure must be higher than
valve pressure. Reset pressure switch
or valve.