Service Checklist - Zoeller EX6220 Owner's Manual

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.
CONDITION
A. Pump will not start or run.
Steps Check Voltage At
No. 1 Line terminals in pump's
control panel
L1 - L2 - L3 (3 Phase)
No. 2 Pump motor terminals in
pump's control panel
T1 - T2 - T3
B. Motor overheats and trips overload or blows fuse.
C. Pumps starts and stops too often.
D. Pump will not shut off.
E. Pump operates but delivers little or no water.
F. Drop in head and/or capacity after a period or use.
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
If No Voltage
Check Disconnect switch, line
fuse, and/or circuit breakers
in power supply circuit.
Check for control circuit
voltage. Check out magnetic
starter contacts, thermal
overloads, and float switches
© Copyright 2022 Zoeller
COMMON CAUSES
- 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
- Check valve stuck open
- Level controls out of adjustment
- Temperature sensor tripping
- Thermal overload switch out of
adjustment or defective
- Pit too small
- Debris under float switch
- Float travel obstructed
- Defective or damaged float switch
- Magnetic starter contacts shorted
- Air lock - check vent hole
- 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
- Increase Pipe Friction
- Clogged line or check valve
- Abrasive material & chemical,
deteriorated impeller and pump housing
Co. All rights reserved.
®
If Voltage
Proceed to No. 2
Check starting relay
and capacitor (1
phase units). Check
pump for ground,
and binding impeller