Corrective Action - Little Giant Pit+Plus JR & SR Manual Del Propietário

MAINTENANCE
Troubleshooting
Troubleshooting
Problem
Circuit breaker tripped or
power turned off
Pump will not
operate
Switch failure
Blocked discharge pipe
Blocked vent pipe
Check valve installed back-
wards
Pump runs, but
Check valve stuck or
does not discharge
unplugged
liquid
Lift too high for pump
Inlet to impeller plugged
Pump is air-locked
Diaphragm switch
Weak or hardened rubber
diaphragm
Plugged vent tube
Dirt or sediment lodged
between retainer ring and
rubber diaphragm causing
Pump does not
contact to remain closed
shut off when
operating in
automatic control
Pump is air locked
™
(with ECM )
Liquid inflow matches pump
capacity
Defective switch
Loose connection in level
control wiring
Lift too high for pump
Low voltage, speed too
slow
Pump does not
deliver rated
Impeller or discharge pipe is
capacity
clogged
Impeller wear due to abra-
sives
No check valve in long dis-
charge pipe allowing liquid
Pump cycles
to drain back into sump
continually
Check valve leaking
Basin too small for inflow
For technical assistance, parts, or repair, please contact:
800.701.7894 | littlegiant.com
998749 Rev. 003 04/22
Probable Causes

Corrective Action

Reset circuit breaker or correct electrical supply.
Disconnect electrical power. Remove the piggyback plug from the
outlet. Plug the pump power cable into the outlet. Turn on electri-
cal power. If the pump operates, the switch is in failure mode.
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.
Replace switch.
Replace rubber diaphragm.
Clear vent tube of any obstructions.
Clean area around rubber diaphragm.
Shut power off for approximately 1 minute, then restart. Repeat
several times to clear air from pump. Check the air bleed hole, refer
to "Physical Installation" on page
Larger pump required.
Disconnect switch, check with ohmmeter, open-infinitive resis-
tance, closed-zero.
Check control wiring.
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.
2.
Franklin Electric Co., Inc. | Oklahoma City, OK 73157-2010
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