Troubleshooting 7
Risk of electrical shock, cuts, and possible unexpected starts. Can result in electrical shock or pinching
of hands or tools. If power to pump is on when thermal overload resets, pump may start without warning. Disconnect
power before servicing pump.
Symptom
Possible Cause(s)
Corrective Action
Motor will not run.
Fuse is blown or circuit breaker tripped.
DISCONNECT POWER; Replace fuse or reset circuit breaker.
Motor runs hot and the
overload kicks off or does not
run and only hums.
Voltage is too low.
Check voltage being supplied to the pump.
Motor runs but no water is
delivered.*
Pump during new installation did not pick up prime through:
1. Improper priming
1. Re-prime according to instructions.
2. Air leaks
2. Check all connections on suction line, with shaving cream.
3. Leaking foot valve.
3. Replace foot valve.
4. Pipe size is too small.
4. Re-pipe using size of suction and discharge ports on pump.
Pump in installation already in use: has lost prime through:
1. Air leaks.
1. Check all connections on suction line and shaft seal with shaving
cream.
2. Water level below suction pipe inlet.
2. Lower suction line into water and re-prime. If receding water level in
well exceeds 25’ (7.6m), a deep well pump is needed.
Impeller is plugged
Clean impeller.
Foot valve is stuck shut
Replace the foot valve.
Pipes are frozen
Thaw pipes.
Foot valve and/or strainer are buried in sand or mud.
Raise the foot valve and/or strainer above bottom of water source. Clean
foot valve and strainer.
*Pump does not deliver water
to full capacity.
Water being pumped is lower than estimated.
A deep well jet will may needed if the water being pumped is more
than 25’ (7.6m) depth to water.
Steel piping (if used) is corroded or limed, causing
excess friction.
Replace with plastic pipe where possible, otherwise with new steel
pipe.
Piping is too small in size
Re-pipe using size of suction and discharge ports on pump.
Pump not being supplied with enough water.
Add additional well points.
* Stop pump; then
check prime before
looking for other causes.
Unscrew priming plug
and see if water is in
priming hole.
Summary of Contents for CLSS5
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