Troubleshooting - Little Giant VCCA-20ULS Owner's Manual

MAINTENANCE

Troubleshooting

Troubleshooting
Problem
Pump is not connected to elec-
trical power.
Circuit breaker off or fuse
removed.
Pump does not start
Accumulation of debris or
when tank is full of
build-up on float.
condensate water.
Float movement obstruction.
Defective switch.
Defective motor.
Pump is not connected to elec-
trical power.
Liquid inflow matches or
exceeds pump output capacity.
Condensate is over- Pump is not level.
flowing from the tank.
Accumulation of debris or
build-up on float.
Check valve stuck or plugged
Outlet flow is blocked.
Pump impeller is not turning.
Defective switch.
Defective motor.
Float movement obstruction.
Pump will not shut off. Liquid inflow matches or
exceeds pump output capacity.
Defective switch.
Check valve stuck or plugged.
Lift too high for pump.
Pump runs but does
Inlet to impeller plugged.
not discharge liquid.
Outlet flow is obstructed.
Check valve stuck or plugged.
Lift too high for pump.
Pump does not deliver
Low voltage, speed too slow.
rated capacity.
Impeller or discharge pipe is
clogged.
Pump cycles continu-
Check valve leaking.
ally.
6
Probable Causes Corrective Action
Connect pump to a dedicated GFCI circuit.
Turn on circuit breaker or replace fuse.
Clean float; a dirty float could be too heavy to operate correctly.
Remove the tank. Check float movement path. Remove any debris or
obstruction.
Replace pump.
Replace pump.
Connect pump to a dedicated GFCI circuit.
Larger pump required.
The high level switch should shut off the A/C unit or signal an alarm in this
condition if connected in the circuit correctly. Check to ensure that the pump
high level switch is connected to the A/C unit (or alarm circuit), and that the
leads are connected to the correct switch terminals for the application. Refer
to "High Water Level Switch Connection" on page
Check to ensure that the pump is level. If the pump is not level, it may not
activate, causing water to overflow from the tank. Place unit on a flat and
level surface.
Clean float. A dirty float could be too heavy to operate correctly.
Remove check valve and inspect for proper operation.
Check outlet tubing to ensure that it is not kinked or blocked. Clear blocked
tubing of slime and debris. Clean inlet and outlet piping.
Clear any blockage in the impeller housing.
Replace pump.
Replace pump.
Remove the tank. Check float movement path. Remove any debris or
obstruction.
Larger pump required.
The high level switch should shut off the A/C unit or signal an alarm in this
condition if connected in the circuit correctly. Check to ensure that the pump
high level switch is connected to the A/C unit (or alarm circuit), and that the
leads are connected to the correct switch terminals for the application. Refer
to "High Water Level Switch Connection" on page
Replace pump.
Remove check valve and inspect for proper operation.
Check rated pump performance.
Pull pump and clean.
Check outlet tubing to ensure that it is not kinked or blocked. Clear blocked
tubing of slime and debris. Clean inlet and outlet piping.
Remove check valve and inspect for proper operation.
Check rated pump performance.
Check that supply voltage matches nameplate rating.
Pull pump and clean. Check pipe for scale or corrosion.
Remove check valve and inspect for proper operation.
4.
4.