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MAINTENANCE
Troubleshooting
Troubleshooting
Problem
Defective switch
Pump is air locked
Pump will not
shut off
Liquid inflow matches
pump capacity
Loose connection in
level control wiring
Check valve installed
backwards
Check valve stuck or
plugged
Lift too high for pump
Pump runs but
does not dis-
Inlet to impeller
charge liquid
plugged
Pump is air locked
Lift too high for pump
Low voltage, speed too
slow
Pump does not
deliver rated
Impeller or discharge
capacity
pipe is clogged
Impeller wear due to
abrasives
6
Probable Causes
Corrective Action
Replace switch after confirming it is defective. An operative
switch should read infinite resistance when open, zero
resistance when closed, using an ohmmeter.
Shut power off for approximately 1 minute. Then restart.
Repeat several times to clear air from pump. If system
includes a check valve, drill a
pipe approximately 2-inches above discharge connections.
Larger pump is required.
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, drill a
pipe approximately 2-inches 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.
3
/
-inch hole in discharge
16
3
/
-inch hole in discharge
16
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