InSinkErator foodservice disposers (LC-50, SS-100 with MRS control): quick sheet

Covers: Commercial / foodservice InSinkErator disposers: LC-50 light-commercial unit and SS-100 1 HP units sold as kits with the MRS manual reverse switch panel and flow control valve. Larger SS-150 / SS-200 units share the concept but were not researched here.

Single sourceBrands: InSinkErator6 components

Handymen meet these in cafés, convenience stores and church kitchens. Unlike a home disposal, the unit is wired to a control panel (forward / stop / reverse) with a magnetic starter and a water solenoid / flow control valve, and SS-100 units come in several voltages. Many no-run calls are a dropped magnetic starter after a power interruption, a jam, or a tripped thermal overload.

Safety first

Lock out the circuit before hands or tools go near the chamber.
Three-phase and 460 V units are electrician work.
Never put hands in the chamber.

How it works

The MRS panel has three buttons (forward, stop, reverse) in a stainless enclosure. Its magnetic starter drops out on a power interruption so the disposer does not restart by itself.

Reversing direction helps clear jams and spreads wear on the cutting elements.

A flow control valve meters all water entering the disposer to conserve water and keep the unit from being overloaded; the SS-100 is listed at about 5 GPM.

The SS-100 uses a heavy-duty induction motor with built-in thermal overload protection; LC-50 is designed for light foodservice duty.

Components & tests

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Official manufacturer documentation

Always confirm values against the tech sheet for the exact model.

OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work. © 2026 OnCall Tech. Original content; not a reproduction of any manufacturer document.Generic part photos (not of this brand): Main electrical panel beside a subpanel with its cover removed by Gvolk, CC BY-SA 3.0

Diagnostic guides for this appliance

Guide · Garbage Disposal

Disposal sink-top air switch (push button) not working

An air switch sends a puff of air down a small tube to a power module under the sink, which toggles the outlet the disposal plugs into. Check the disposal itself first, then the tube, the button and the module. Some InSinkErator single-outlet SinkTop Switch modules (2005-2017) were recalled for water entry and overheating.

6 steps ~30 mineasy

Guide · Garbage Disposal

Garbage disposal trips the GFCI (not the breaker)

A GFCI trips on current leaking to ground, not on overload. A wet or failing disposal (bottom leak into the motor, damaged cord, bad splice) is the most likely cause; motor leakage on older units and a shared circuit with the dishwasher can add up. Diagnose the leak; never solve it by removing GFCI protection where the local code requires it.

7 steps ~45 minmoderate

Guide · Garbage Disposal

Garbage disposal hums but won't turn (jammed)

A humming disposal almost always has a jammed turntable: a hard object or packed waste is stopping the motor. Free the plate with the hex wrench from below (or a wrench on the impellers from above), clear the debris, then reset the overload. Never put a hand in the grinding chamber.

6 steps ~20 mineasy

Other garbage disposals manuals

Manual · Garbage Disposal

InSinkErator Badger series disposals: quick sheet

Badger-branded continuous-feed disposals: Badger 1 / Badger 100 (1/3 HP), Badger 5 / Badger 500 (1/2 HP), Badger 5XP (3/4 HP), with or without factory cord (W/C suffix = with cord). Production years vary; read the model and date code on the unit's label.

9 components5 common failuresInSinkErator

Manual · Garbage Disposal

InSinkErator Evolution / Advanced series disposals: quick sheet

Evolution-branded continuous-feed units: older Evolution Excel (1 HP, 3-stage), Evolution Septic Assist (3/4 HP, 2-stage) and the current Advanced Series Evolution 35SS (5/8 HP), 45SS (3/4 HP) and 55SS (1 HP). Confirm the exact model from the label; many older Evolution SKUs are discontinued.

8 components5 common failuresInSinkErator

Manual · Garbage Disposal

Waste King, Whirlaway and Moen disposals (Anaheim-built): quick sheet

Continuous-feed disposals from Anaheim Manufacturing (a Moen subsidiary): Waste King Legend / Pro / Custom, Whirlaway, and Moen GX / GX Pro series. Mount type (EZ Mount vs 3-bolt) and motor speed vary by model; read the label.

7 components5 common failuresWaste King, Whirlaway, Moen