MAINTENANCE
Troubleshooting
10
Troubleshooting
Problem
Probable Causes
Corrective Action
Pump does not turn on
Pump is not connected to power.
Power the pump according to the manual.
Circuit breaker is off or fuse is removed.
Turn on circuit breaker or replace fuse.
Accumulation of trash on float.
Clean float.
Float obstruction.
Clean float path and provide clearance.
Defective switch.
Replace switch.
Defective motor.
Replace pump.
The heat sensor has shut down the system.
“Thermal Protection” on page 9
. Wait 15 minutes for system to
reset.
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 dis
-
charge liquid
Check valve installed backwards.
Check flow indicating arrow on check valve body to ensure proper installa
-
tion.
Check valve stuck or plugged.
Remove check valve and inspect for proper installation.
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 nameplate rating.
Impeller or discharge pipe is clogged.
Pull pump and clean. Check pipe for scale or corrosion.
Impeller wear due to abrasives.
Replace worn impeller.
Pump cycles continually
No check valve in long discharge pipe allowing
water to drain back into basin.
Install a check valve in the discharge line.
Check valve leaking.
Inspect check valve for correct operation.
Basin too small for inflow.
Install larger basin.
