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Troubleshooting
Problem
Pump not plugged in
Circuit breaker off or fuse removed
Accumulation of trash on float
Pump does
not turn on
Float obstruction
Defective switch
Defective motor
Float or float rod obstruction
Pump will
Pump is air locked
not shut off
Liquid inflow matches pump capacity
Defective switch
Check valve installed backwards
Pump runs
Check valve stuck or plugged
but does not
discharge
Lift too high for pump
liquid
Inlet to impeller plugged
Pump is air locked
Lift too high for pump
Rotation incorrect (three-phase only)
Pump does
not deliver
Low voltage, speed too slow
rated
capacity
Impeller or discharge pipe is clogged
Impeller wear due to abrasives
No check valve in long discharge pipe
allowing liquid to drain back into basin
Pump cycles
continuously
Check valve leaking
Basin too small for inflow
Water
There should be a bleed hole in the dis-
sprays out of
charge pipe that allows trapped air to
a hole in the
escape from the pump, preventing air lock
discharge
Water spraying out of this hole is com-
pipe.
pletely normal
Probable Causes
Corrective Action
Plug in pump.
Turn on circuit breaker or replace fuse.
Clean float.
Check float path and provide clearance.
Replace switch.
Replace pump.
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 installation.
Remove check valve and inspect for proper
operation.
Check rated pump performance.
Pull pump and clean.
Remove pump and clean air bleed hole.
Check rated pump performance.
Switch any two of the line wires.
Check that supply voltage matches the
nameplate rating.
Pull pump and clean. Check pipe for scale
or corrosion.
Replace pump.
Install a check valve in discharge line.
Inspect check valve for correct operation.
Install larger basin.
No corrective action is required.
MAINTENANCE
Troubleshooting
7
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