Service Manual 27
Commercial Disposers
Problem Cause Solution
Overload protector is tripped or fuse/
circuit breaker blows immediately
after starting disposer.
Direct short in stator windings. Test stator windings and replace stator if open. See
“Stator” on page 20.
Incorrect wiring connections. See applicable wiring diagram in installation manual.
Start switch wired incorrectly. See applicable wiring diagram and correct connec-
tions.
Contact on start switch is welded (1
Phase only).
Replace contact or start switch. See “Replacing Start
Switch (1 Phase Models)” on page 19.
Incorrect voltage. Check disposer electrical specications, power sup-
ply, and stator lead connections.
Improper fuse or circuit breaker. Check fuse or circuit breaker and have an electrician
correct if necessary.
Disposer motor runs but little or no
water runs.
Faulty overload protector. Test and replace overload protector if necessary. See
“Overload Protector” on page 16.
Water supply is shut off. Open water supply valve and adjust for the recom-
mended gallons per minute (GPM). See “Cold Water
Flow & Drain Line Diameter” on page 3.
Faulty water solenoid. Replace water solenoid.
Low water pressure. Consult plumber regarding solution.
Improperly installed or inoperative
time delay relay.
See applicable wiring diagram for proper connections.
Replace time delay relay if faulty.
Water in stator. Bearing seals worn. Replace with bearing and seal kit. See “Repairing Up-
per End Bell Assembly” on page 13.
Upper end bell cracked or eroded. Replace upper end bell. See See “Repairing Upper
End Bell Assembly” on page 13.
Water sprayed into motor during
cleaning.
Instruct cleaning crew no to spray disposer with water.
Disposer squeals during operation. Bearings are worn. Replace with bearing and seal kit. See “Repairing Up-
per End Bell Assembly” on page 13.
Rotor core loose on rotor shaft as-
sembly.
Replace rotor shaft assembly. See “Repairing Upper
End Bell Assembly” on page 13.
Disposer vibrates excessively. Excessive water entering disposer. Adjust water ow to recommended gallons per minute
(GPM). See “Cold Water Flow & Drain Line Diameter”
on page 3.
If unit is installed with #5 mounting assembly, drain wa-
ter from sink before operating disposer.
Disposer oveloaded with hard food
waste or non-biodegradable mate-
rial.
Clear disposer of waste and do not overload.
Water leaks at mounting or waste
discharge.
Improper installation. See Installation Guide and reinstall disposer.
Loose mounting screws. Tighten all mounting screws. Tighten locking ring if #5
mounting assembly is used.
Pinched or broken mounting gasket. Replace mounting gasket.
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