Troubleshooting - Little Giant WRS-5 Owner's Manual

Troubleshooting

Problem
Weak or hardened rub-
Dirt or sediment lodged
between retainer ring
and rubber diaphragm
Pump will not
shut off
Liquid inflow matches
Check valve installed
Pump runs but Lift too high for pump.
does not dis-
charge liquid.
Lift too high for pump.
Low voltage, speed too
Pump does not
deliver rated Impeller or discharge
capacity.
Probable Causes
Diaphragm switch.
ber diaphragm.
Plugged vent tube.
causing contacts to
remain closed.
Pump is air locked.
pump capacity.
Defective switch.
Loose connection in
level control wiring.
backwards.
Check valve stuck or
plugged.
Inlet to impeller
plugged.
Pump is air locked.
slow.
pipe is clogged.
Impeller wear due to
abrasives.
Corrective Action
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. If system
includes a check valve, a 3/16" hole should be drilled in dis-
charge pipe approximately 2" above discharge connections.
Larger pump required.
Disconnect switch. Check w/ohmmeter. Open-infinitive
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.
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 dis-
charge pipe approximately 2" above discharge connections.
Check rated pump performance.
Check for proper supply voltage to make certain it corre-
sponds to nameplate voltage.
Pull pump and clean. Check pipe for scale or corrosion.
Replace worn impeller.
MAINTENANCE
Troubleshooting
Replace switch.
7