Troubleshooting - Little Giant 14S-CIM Manual

PROBLEM
Pump does not turn on.
NOTE: Before troubleshooting automatic
control, check to see that pump operates
on manual control. To do this, unplug from
in-line float switch plug. Plug pump power
cord into wall outlet. If pump works, proceed
to check switch; if not, fault is in pump or
power supply.
Pump will not shut off.
Pump runs but does not discharge liquid.
Pump does not deliver rated capacity.
Pump cycles continually.
6
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TROUBLESHOOTING

PROBABLE CAUSES
Pump not plugged in.
Circuit breaker shutoff or fuse removed.
Accumulation of trash on mercury float switch.
Mercury float switch obscruction.
Defective switch.
Defective motor.
Mercury switch float obstruction.
Pump is air locked.
Liquid inflow matches pump capacity.
Defective switch.
Loose connection in level control wiring.
Check valve installed backwards.
Check valve stuck or plugged.
Lift too high for pump.
Inlet to impeller plugged.
Pump is air locked.
Lift too high for pump.
Low voltage, speed too slow.
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.
Check valve leaking.
Basin too small for inflow.
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CORRECTIVE ACTION
Plug in pump.
Turn on circuit breaker or replace fuse.
Clean float.
Check float path and provide clearance.
Disconnect switch, check with ohmmeter:
Open=infinite resistance, closed=zero.
Have pump serviced.
Check float path and provide clearance.
Shut power off for approximately 1 minute, then
restart. Repeat several times to clear air from pump.
If system includes a check valve, a 3/16" hole should
be drilled in discharge pipe approximately 2" above
discharge connections.
Larger pump required.
Disconnect switch, check with ohmmeter:
Open=infinite resistance, closed=zero.
Check control wiring.
Check flow indicating arrow on check valve body to
insure it is installed properly.
Remove check valve and inspect for proper operation.
Check rating table.
Pull pump and clean.
(See corrective action above.)
Check rated pump performance.
Check for proper supply voltage to make certain it
corresponds to nameplate voltage.
Pull pump and clean. Check pipe for scale or
corrosion.
Replace worn impeller.
Install a check valve in discharge line.
Inspect check valve for correct operation.
Install larger basin.