Inside a worn garbage disposal: rusty grinding plate and lugs seen from the sink

Field pattern: 'disposal is dead, needs a new one' (reset, jam and power first; a leaking body is the real replace)

Most dead or humming disposals are a jam that tripped the overload, a tripped GFCI or breaker, or a wall or air switch fault. Freeing the flywheel with the hex key and pressing the reset button is the first step. The opposite trap is fixing a jam on a unit that leaks from the body; that one needs replacing.

Cross-checked ~30 min easyBrands: InSinkErator, KitchenAid, Moen, Waste King, All

Before you start

Turn off power at the switch and the breaker, or unplug the disposal, before reaching into or under it
Never put a hand into the grinding chamber; use tongs or pliers
Wiring connections at the disposal and the switch are line voltage; verify zero voltage before opening the cover plate

Diagnostic steps

Unlock all 6 steps with expected values

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More garbage disposals guides

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

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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

Field pattern: disposal 'leaking from the bottom, replace it' (rule out elbow gasket and hoses before condemning)

A true leak from the body (often at the reset button or bottom cover) means the internal seals or housing failed, and the unit gets replaced because those seals are not sold as parts. But water from a dishwasher hose, a loose discharge elbow or a bad elbow gasket can run down the shell and drip off the bottom too; Moen notes an elbow gasket leak can exit through the bottom plate. Do the towel test first.

6 steps ~30 mineasy