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 functioning 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 capac-
ity.
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 name-
plate 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 con-
tinuously
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 dis-
charge pipe.
There should be a bleed hole in the
discharge pipe that allows trapped
air to escape from the pump, pre-
venting air lock.
Water spraying out of this hole is
completely normal.
No corrective action is required.
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