Why is my garbage disposal not working?
A garbage disposal that's dead or just humming is usually a tripped reset button ($0 to fix) or a jammed grinding plate ($0 with the hex wrench that came with the unit). Electrical failures, motor burnout, or a cracked housing are when replacement makes sense — a new disposal runs $80–$200 for the unit and $150–$300 installed.
Most disposal calls end with the tech pressing the reset button on the bottom of the unit — it's a thermal overload switch that trips when the motor overheats. If you can reset it and the plate spins freely, you don't need a tech. If the motor hums but nothing turns after unjamming, the motor has seized and the unit needs to be replaced.
Most likely causes
Tripped reset button (thermal overload)
$0How to tellDisposal is completely silent when you flip the switch — no hum, no grinding, nothing. Happened after a heavy use session or after it ran dry for a long time.
The fixLook under the sink. At the very bottom of the disposal unit you'll find a small red or black button — the reset button. Press it until you feel it click. Then try the switch again.
Jammed grinding plate
$0How to tellDisposal hums loudly when switched on but nothing turns; goes silent after a few seconds (overload protection kicks in); happened after grinding something hard (a bone, pit, or silverware)
The fixTurn off the disposal switch. Find the hex (Allen) wrench socket at the very bottom center of the unit. Insert a 1/4-inch hex wrench and crank it back and forth to free the jammed plate. Remove the obstruction from inside (use tongs, not your hand). Press the reset button and try again.
Clogged drain line (not the disposal itself)
$0 DIY / $75 – $200 plumber visitHow to tellDisposal runs normally but water backs up into the sink and drains slowly; may also back up into the second sink basin
The fixThe disposal is fine — the P-trap or drain line under the sink is clogged. Clear the P-trap or snake the drain line. If it clogs repeatedly, a plumber may need to clear further down the line.
Burned-out motor
$80 – $200 unit + $150 – $300 installationHow to tellReset button won't stay set (pops back out immediately); plate moves freely with the hex wrench but motor still hums and trips; smell of burning plastic or rubber from the unit
The fixReplace the disposal unit — motor burnout is not repairable on residential disposals. Match the horsepower of the old unit (1/2 HP is common; 3/4 or 1 HP for heavier use).
Leaking from the housing or sink flange
$0 – $300 depending on sourceHow to tellWater dripping from the bottom of the disposal unit, from the side connection, or from around the sink flange (where the disposal meets the sink drain)
The fixLeaks from the bottom = internal seal failure — replace the unit. Leaks from the flange = reset the mounting assembly with new plumber's putty. Side discharge leaks = tighten the drain connection.
Try this first (before you pay anyone)
- Turn the disposal switch OFF. Look under the sink at the bottom of the disposal — find the small button (usually red) at the very center bottom of the unit. Press it until it clicks. Turn the switch back on. This alone fixes most dead disposal calls.
- If the disposal hums but doesn't turn, flip the switch off immediately (more than a few seconds of humming = overload trip). Find the small hex-wrench socket at the very bottom center of the unit. Insert a 1/4-inch Allen wrench and rotate it back and forth — you're manually turning the grinding plate to free whatever is jamming it. Remove the jam from inside the drain opening (use tongs, not fingers). Then press the reset button and try the switch again.
- Run cold water before, during, and after use. Hot water melts fats that then solidify further down the drain line — cold water keeps grease solid so the disposal can grind and flush it properly.
- If water backs up into both basins, the problem is the drain line — not the disposal. The disposal may run fine; the P-trap or drain line needs to be cleared separately.
Unlock the hiring checklist
Use this before you call an appliance repair, so you know what to ask and what to avoid.
Call a pro when…
- The reset button won't stay set (pops out immediately after pressing) and the hex wrench turns the plate freely — the motor is burned out and the unit needs replacement
- The disposal is leaking from the bottom — an internal seal failure means the housing is cracked or a seal has failed; replacement is the correct fix, not a seal repair
- The drain line is backing up into multiple fixtures (both sinks, even the dishwasher) — that's a deeper drain line blockage that needs a plumber's snake or hydrojetting
- The disposal is making a loud metallic grinding sound — something hard (bone, spoon, glass) is caught in the grinding ring and should be removed carefully before running the unit again
Repair or replace?
Garbage disposals last about 10–12 years. Because the unit cost is so low ($80–$200 for a quality replacement), the repair vs replace math is simple: if the reset and hex-wrench tricks don't fix it, replace it. A plumber or handyman installs a new disposal in 30–60 minutes. Total installed cost of a new unit ($150–$300 for budget, $300–$500 for a premium InSinkErator or Moen) is almost always less than the cost of diagnosing and attempting to repair a seized motor. The only repair that makes sense is clearing a jam or fixing a loose flange — everything else justifies a new unit.
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Related questions
Where is the reset button on a garbage disposal?
The reset button is on the very bottom of the disposal unit — underneath the sink, at the lowest point of the disposal housing. It's usually a small red or black circular button. If the disposal is dead silent, press this button firmly until you feel a click, then try the switch again. Most dead disposals come back to life with this step.
Why does my garbage disposal hum but not turn?
Humming without turning means the motor is trying to run but the grinding plate is jammed. Turn the switch off immediately — prolonged humming trips the overload and burns the motor. Find the hex-wrench socket at the bottom center of the unit and use a 1/4-inch Allen wrench to rotate the plate back and forth until it moves freely. Remove the obstruction from inside, press the reset button, and try again.
How much does it cost to replace a garbage disposal?
The unit itself runs $80–$200 for a standard residential disposal (1/2 to 3/4 HP). Installation by a plumber or handyman adds $150–$300, for a total installed cost of roughly $230–$500. Premium brands like InSinkErator Evolution or Moen Prep run higher. Many homeowners replace disposals themselves — it's a 30-minute job with a mounting wrench and basic plumbing connections.
What should you never put in a garbage disposal?
The items that cause the most service calls: bones and fruit pits (too hard for residential disposals), celery and artichoke fibers (wrap around the motor shaft), coffee grounds and eggshells (create a pasty buildup in the drain), and expandable foods like pasta or rice (swell after grinding and pack the drain line). Grease should never go down any drain, disposal or not.