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© Copyright 2017 Zoeller
®
Co. All rights reserved.
Service Checklist
Electrical precautions. Before servicing a grinder pump, always shut off the main power circuit. Make sure you are wearing
insulated protective sole shoes and not standing in water. Under flooded conditions, contact your local electric company or a qualified
licensed electrician for disconnecting electrical service to the pump prior to removal.
Grinder pumps contain oil which becomes pressurized and hot under operating conditions. Allow 2½ hours after shut down
before servicing pump.
MAIL TO:
P.O. BOX 16347 • Louisville, KY 40256-0347
SHIP TO:
3649 Cane Run Road • Louisville, KY 40211-1961
(502) 778-2731 • 1 (800) 928-PUMP •
FAX
(502) 774-3624
Visit our web site:
zoellerpumps.com
Condition
Common Causes
A. Pump will not start or run.
Blown panel or circuit breaker fuse, low voltage, thermal overload open, defective capacitor
circuit, cutter clogged, damaged hydraulic stator or rotor, float switch held down or defective,
incorrect wiring in control panel, water in cap assembly, check valve not installed or
malfunctioning.
B. Motor overheats and trips on overload.
Incorrect voltage, hydraulic rotor or cutter blocked, negative head (discharge lower than intake
of pump). Defective “off” float. Pump runs continuously at low water level. Low oil level in motor
shell. Pump running at shut-off head, check valve not installed or malfunctioning.
C. Pump will not shut off.
Debris under float assembly, defective switch, incoming sewage exceeds capacity of pump.
D. Pump operates but delivers little or no water.
Intake clogged with grease or sludge, damaged hydraulic stator or rotor, low or incorrect voltage,
clogged discharge line, operating near shut-off head.
E. Pump starts and stops too often.
Check valve stuck open or defective. Sump pit too small to handle incoming sewage. Level
control out of adjustment. Thermal overload tripping.
F. Large red flashing light comes on at control box.
High water in pit. Check pump for clogging, or overload trip.
G. Grease and solids accumulate in pit around pump.
Break up solids and run pump with water running into the pit. Allow level to lower to the pump
intake. Continue until solids are cleared from the pit. Do not drain kitchen grease down the sink.
