© Copyright 2013 Zoeller Co. All rights reserved.
ELECTRICAL PRECAUTIONS.
Before servicing a pump, always shut off the main power breaker to the panel and then disconnect the pump - making
sure you are wearing insulated protective sole shoes and are not standing in water. Under flooded conditions, contact your local electric company or a qualified licensed
electrician for disconnecting electrical service prior to pump removal.
Submersible pumps contain oils which become pressurized and hot under operating conditions -
allow 2½ hours after disconnecting before
attempting service.
CONDITION
A. Pump will not start or run.
COMMON
CAUSES
B. Motor overheats and trips overload or blows fuse.
- Incorrect Voltage
- Unbalanced power source
- Incorrect motor rotation
- Negative or low head
- Excessive water temperature
- Impeller, cutter, or seal mechanically bound
- Motor shorted
- Lost a leg in a Three Phase unit
C. Pump starts and stops too often.
- Check valve stuck open
- Level controls out of adjustment
- Temperature sensor tripping
- Thermal overload switch out of
adjustment or defective
- Pit too small
D.
Pump will not shut off.
- Debris clogging cutter mechanism.
- Debris under float switch
- Float travel obstructed
- Damaged float switch
- Magnetic starter contacts shorted
- Air lock - check vent hole
E.
Pump operates but delivers little or no water.
- Check for plugged cutter, pump housing,
pipe or sticking check valve
- Vent hole clogged or not drilled
- Discharge head exceeds pump’s capacity
- Low or incorrect voltage
- Incorrect motor rotation
F.
Drop in head and/or capacity after a period or use.
- Increase pipe friction
- Clogged line or check valve
- Abrasive material and chemical,
deteriorated impeller and pump housing
If the above check list does not uncover the problem, consult the factory. Do not attempt to service or otherwise disassemble pump.
SERVICE CHECKLIST & TROUBLESHOOTING
Steps
Check Voltage At
If No Voltage
If Voltage
No. 1
Line terminals in pump's
Check Disconnect switch, line
Proceed to No. 2
control panel
fuse, and/or circuit breakers
L
1
- L
2
- L
3
(3 Phase)
in power supply circuit.
No. 2
Pump motor terminals in
Check for control circuit
Check starting relay
pump’s control panel
voltage.
Check out magnetic
and capacitor (1
T
1
- T
2
- T
3
starter contacts, thermal
phase units).
Check
overloads, and float switches
pump for ground,
and binding impeller