Franklin Electric NCX Series Owner's Manual page 10

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