What it usually means, the likely causes in order, what to safely try first, what a pro charges in Canada, and when to stop and call one.
This guide covers the common cases. Describe your exact problem and get a personalized diagnosis — free to start, with a DIY vs. call-a-pro verdict and a real cost estimate.
A garbage disposal that hums but doesn't grind, buzzes and cuts out, or does nothing at all has almost always met something it couldn't chew — a bone fragment, a bottle cap, a spoon that fell in unnoticed — or it has tripped its own built-in overload protection while trying. Disposals are forgiving machines with two owner-level resets: the red button underneath that pops when the motor overheats, and the hex socket in the very bottom that lets you rock the flywheel free by hand. Between those two and a pair of tongs, most 'dead' disposals are ten minutes from working again — as long as hands stay out of the chamber, always.
Not urgent, with one behavioural rule: stop flipping the switch on a jammed disposal. Every attempt overheats the motor and re-trips the overload (or worse), so try once, hear the hum, switch off, and go to the manual steps. The sink remains usable for everything except grinding — just be careful what rinses into a disposal that isn't turning, and don't let food sit in it for days.
The classic cause: a bone chip, pit, bottle cap, twist-tie, or a piece of flatware wedges between the impellers and the grind ring. The motor hums with effort, can't turn, and trips its overload — by design, before it burns out.
The small red or black button on the underside pops out when the motor overheats or jams. Sometimes the jam clears (a soft obstruction passes) and only the button needs resetting — but a button that trips again immediately means the cause is still in there.
A disposal that is completely silent — no hum at all — may simply have no power: a tripped GFCI outlet under the sink, a tripped breaker, or an unplugged cord. Silence and a hum are different diagnoses, and silence starts at the outlet.
If the flywheel turns freely by hand, the reset holds, power is confirmed, and the unit still won't run (or it leaks from the body of the unit itself — a seal failure), the disposal is likely done. Age, rust at the base, and leaks from the housing rather than the connections are the end-of-life signature.
| Job size | Typical estimate (CAD) |
|---|---|
| Simple fix — the straightforward version of this repair | $110–$250 |
| Major job — complex, hidden, or replacement-level work | $300–$900 |
Estimates only, calibrated to Greater Toronto Area trade rates and adjusted by region on this site — not a quote. Your exact price depends on the cause, parts, and access. A personalized diagnosis narrows this range using your specific symptom.
Reset button, hex-wrench freeing, obstruction retrieval with tongs, and GFCI/power checks are the designed owner maintenance and fix most jams. Replacement of the unit itself is a well-trodden DIY-with-plumbing path for some owners, but it involves drain connections, dishwasher hose hookups, and sometimes hardwiring — a pro installs one quickly with a warranty on the connections. Choose the pro route if the old unit is hardwired, if the mounting or drain alignment looks nonstandard, or if there's any sign of water damage in the cabinet to assess at the same time.
The motor is powered and trying, but the flywheel can't rotate — something is wedged, or the flywheel is seized. The hum is the motor straining, and it will trip its overload shortly to protect itself. Switch it off, free the flywheel from below with a hex wrench, retrieve the object with tongs, reset, and test with cold water running.
It's a small red or black button on the underside of the unit, usually near the bottom centre. It's a thermal overload protector: when the motor overheats (typically from a jam), the button pops out and cuts power to save the motor. Pressing it back in restores the circuit once the motor has cooled — but if the jam remains, it will trip again, correctly.
The regular culprits behind jams and clogs: large bones, fruit pits, coffee grounds in quantity, fibrous material like celery and onion skins (they wrap the impellers), grease (it coats the drain past the disposal), and expandable starches like pasta and potato peels in bulk. And the non-food list — bottle caps, twist ties, and dropped flatware — accounts for most hard jams; a sink strainer prevents them.
Leaks at the hose or drain connections can be tightened or resealed, but water coming through the body of the unit itself means the internal seal has failed and the motor housing is getting wet — that's a replacement, not a repair, and it shouldn't be deferred, because the leak will grow and the cabinet floor is underneath it.
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