MAINTENANCE
Troubleshooting
10
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.
Accumulation of trash on float.
Clean float.
Float obstruction.
Check float path and provide clearance.
Defective switch.
Replace switch.
Defective motor.
Replace pump.
Pump will not shut off
Float or float rod obstruction.
Check float and float rod path and provide clearance.
Pump is air locked.
Remove pump and clean air bleed hole.
Liquid inflow matches pump capacity. Larger pump required.
Defective switch.
Replace switch.
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 continuously
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 dis
-
charge pipe that allows trapped air to
escape from the pump, preventing air
lock.
Water spraying out of this hole is com
-
pletely normal.
No corrective action is required.
