Little Giant 15EC-CIA-SFS Manual Del Propietário página 7

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 is air locked.
Pump will
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
Pump does
Low voltage, speed too slow
not deliver
rated
Impeller or discharge pipe is clogged
capacity
Impeller wear due to abrasives
No check valve in long discharge pipe allow-
ing 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 discharge
sprays out of pipe that allows trapped air to escape from
a hole in the the pump, preventing air lock.
discharge Water spraying out of this hole is completely
pipe. normal.
Obstructed pump impeller
Protector
Pump air-locked
tripping
(motor
overloading/
Excessively high or low voltage supply
overheating
Pump, motor, bearings, or seal have reached
the end of their useful life
Probable Causes Corrective Action
Plug in pump.
Turn on circuit breaker or replace fuse.
Clean float.
Check float path and provide clearance.
Replace pump.
Replace pump.
Check float and float rod path and provide clearance.
Remove pump and clean air bleed hole.
Larger pump required.
Replace pump.
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.
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.
Pull pump and clean. Check pipe for scale or corrosion.
Shut power off for approximately 1 minute, then
restart. Repeat several times to clear air from pump. If
this does not resolve the problem, clean the vent hole.
Refer to "Maintenance" on page
Refer to "Specifications" on page
Replace pump.
MAINTENANCE
Troubleshooting
6.
1.
7