MAINTENANCE
Troubleshooting
7
Troubleshooting
Problem
Probable Causes
Corrective Action
Pump does not turn on
Pump not plugged in.
Plug in pump.
Circuit breaker off or fuse removed.
Turn on circuit breaker or replace fuse.
Defective motor.
Replace pump.
Float switch or other level controls not func
-
tioning correctly
Refer to the float switch manual.
Pump will not shut off
Pump is air locked.
Remove pump and clean air bleed hole.
Liquid inflow matches pump capacity.
Larger pump required.
Pump runs but does not
discharge liquid
Check valve installed backwards.
Check flow indicating arrow on check valve body to ensure
proper installation.
Check valve stuck or plugged.
Remove check valve and inspect for proper operation.
Lift too high for pump.
Check rated pump performance.
Inlet to impeller plugged.
Pull pump and clean.
Pump is air locked.
Remove pump and clean air bleed hole.
Pump does not deliver
rated capacity
Lift too high for pump.
Check rated pump performance.
Low voltage, speed too slow.
Check that supply voltage matches the nameplate rating.
Impeller or discharge pipe is clogged.
Pull pump and clean. Check pipe for scale or corrosion.
Impeller wear due to abrasives.
Replace pump.
Pump cycles continu
-
ously
No check valve in long discharge pipe allowing
liquid to drain back into basin.
Install a check valve in discharge line.
Check valve leaking.
Inspect check valve for correct operation.
Basin too small for inflow.
Install larger basin.
Water sprays out of a
hole in the discharge
pipe.
There should be a bleed hole in the discharge
pipe that allows trapped air to escape from the
pump, preventing air lock.
Water spraying out of this hole is completely
normal.
No corrective action is required.
