20
Troubleshooting
Symptom Cause Remedy
Feed pump runs but no pressure
No lights on the switches
Pump will not run
Feed pump air locked
Pressure relief valve open
Battery fuse blown
Battery dead
Main Power switch off
Pump Fuse blown
Open pressure relief valve, run until
there are no bubbles in the line and
then close valve
Close valve
Replace fuse
Be sure battery is charged before
storage
Be sure lights are off on switches
when storing
Main Power switch on
Replace Fuse
Feed pump starts but shuts down
on high pressure
Prefilter clogged
Closed valve or blockage in flow
Change filter
Check flow path for closed valve or
kink in hose
Low water production
High feed pressure
Strainer or prefilter clogged
Service prefilter and strainer
Low water production,
Low pressure
Pressure relief valve partially open
Worn pump head
Close valve
Check flow, should be 1.4 GPM
Close off discharge hose and pres-
sure should build to 120psi, if not
the pump head needs to be re-
placed
Water production normal, but
high feed pressure and/or high
amperage
Cold seawater temperature
Fouled membrane
Normal condition
Clean membrane
Water production normal, but
lower pressure, and lower amper-
age
Warm sea water or brackish water.
Normal condition
Asymmetrical pressure and flow
readings between pump shifts
Check valve leaking
Failed annular ring
Shaft seal leaking
Contact dealer or see the Clark
Pump repair manual.
