Troubleshooting - Little Giant SPK Serie Manual Del Propietário

Troubleshooting

Problem
Circuit breaker tripped or
power turned off
Pump will not operate
For models equipped with dia-
phragm switch: breather tube
kinked, pinched, or blocked.
Blocked discharge pipe
Blocked vent pipe
Check valve installed back-
wards
Pump runs, but does Check valve stuck or
not discharge liquid unplugged
Lift too high for pump
Inlet to impeller plugged
Pump is air-locked
Pump is air locked due to
clogged air relief hole
Liquid inflow matches pump
capacity
Pump will not shut off
For models equipped with dia-
phragm switch: breather tube
kinked, pinched, or blocked
Defective switch
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 Replace worn impeller.
No check valve in long dis-
charge pipe allowing liquid to
Pump cycles continu-
drain back into sump
ally
Check valve leaking
Basin too small for inflow
Probable Causes Corrective Action
Reset circuit breaker or correct electrical supply.
Confirm power cord is not kinked or pinched and confirm that breather tube
end opening is not blocked.
Clean discharge pipe.
Clean vent pipe. Make sure the air admittance valves are not restricting the
free passage of air in the vent pipe.
Check flow indicating arrow on check valve body to ensure it is installed
properly.
Remove check valve and inspect for proper operation.
Check rating table.
Pull pump and clean.
Consult the pump installation instructions. Make sure the 3/16" hole in the
discharge pipe inside the basin is not present or is blocked to allow air to
escape the pump volute.
Clean obstruction from air relief hole in discharge pipe.
Larger pump required.
Confirm power cord is not kinked or pinched and confirm that breather tube
end opening is not blocked.
Replace switch.
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.
Install a check valve in discharge line.
Inspect check valve for correct operation.
Install larger basin.
MAINTENANCE
Troubleshooting
5