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 2-1/2 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 or seal mechanically bound
- Defective capacitor or relay
- Motor shorted
- Lost one line in a Three Phase unit
C. Pumps starts and stops too often.
- Check valve stuck open
- Level controls out of adjustment
- Thermal overload switch out of
adjustment or defective
- Pit too small
D. Pump will not shut off.
- Debris under float switch
- Float travel obstructed
- Defective or damaged float switch
- Magnetic starter contacts shorted
- Air lock - check vent hole
E. Pump operates but delivers little or no water.
- Check for plugged Pump housing, discharge
pipe or sticking check valve
- Vent hole clogged or not drilled
- Discharge head exceeds pumps capacity
- Low or incorrect voltage
- Incorrect motor rotation
- Defective capacitor
F. Drop in head and/or capacity after a period or use.
- Increase Pipe Friction
- Clogged line or check valve
- Abrasive material & 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 & Trouble Shooting
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
© Copyright 2023 Zoeller
®
Co. All rights reserved.
8
These are the original installation instructions.
