TROUBLESHOOTING INFORMATION
PROBLEM
PROBABLE CAUSES
CORRECTIVE ACTION
Pump does not turn on.
NOTE: Before troubleshooting
automatic control, check to see that
pump operates on manual control.
To do this, unplug from in-line float
switch plug. Plug pump power cord
into wall outlet. If pump works,
proceed to check switch, if not, fault
is in pump or power supply.
Pump not plugged in.
Plug in pump.
Circuit breaker shutoff or fuse removed.
Turn on circuit breaker or replace fuse.
Accumulation of trash on mercury float switch. Clean float.
Remote float switch obstruction.
Check float path and provide clearance.
Defective switch.
Disconnect switch, check w/ohmmeter. Open-infinitive resistance,
closed-zero.
Defective motor.
Have pump serviced.
Pump will not shut off.
Remote float switch obstruction.
Check float path and provide clearance.
Pump is air locked.
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 discharge pipe
approximately 2" above discharge connections.
Liquid inflow matches pump capacity.
Larger pump required.
Defective switch.
Disconnect switch, check w/ohmmeter, Open-infinitive resistance,
closed-zero.
Loose connection in level control wiring.
Check control wiring.
Pump runs but does not discharge
liquid.
Check valve installed backwards.
Check flow indicating arrow on check w/ohmmeter, Open-infinitive
resistance, closed-zero.
Check valve stuck or plugged.
Remove check valve and inspect for proper operation.
Lift too high for pump.
Check rating table.
Inlet to impeller plugged.
Pull pump and clean.
Pump is air locked.
(See corrective action above.)
Pump does not deliver rated
capacity.
Lift too high for pump.
Check rated pump performance.
Low voltage, speed too slow.
Check for proper supply voltage to make certain it corresponds to
nameplate voltage.
Impeller or discharge pipe is clogged.
Pull pump and clean. Check pipe for scale or corrosion.
Impeller wear due to abrasives.
Replace worn impeller.
Pump cycles continually.
No check valve in long discharge pipe allowing
liquid to drain back into basin.
Install a check valve in discharge line.
Check valve leaking.
Inspect check valve for correct operation.
Basin too small for inflow.
Install larger basin.
6
