Why Is My Garbage Disposal Not Working? (8 Causes and How to Fix Each One)

Why This Happens

A garbage disposal that stops working is usually caused by a jam, a tripped internal breaker, or an electrical issue at the outlet. Food debris like bones, fibrous vegetables, or grease buildup can lock the grinding plate, while overloading the unit often trips its built-in safety switch. In rarer cases, the motor itself may have burned out or a wiring connection has come loose.

Fix 1: Press the Reset Button
Easy

Every garbage disposal has a small red or black reset button on the bottom of the unit underneath the sink. When the motor overheats or gets overloaded, this thermal breaker trips automatically to protect the motor. Reach under the sink, feel for the small button on the very bottom of the disposal canister, and press it firmly until it clicks. Then turn on the cold water, flip the wall switch, and test if the disposal spins freely. If the button keeps popping back out, wait 10 minutes for the motor to cool before trying again.

Time needed: 1–2 minutes

Fix 2: Check the Electrical Connection
Easy

If pressing reset does nothing and the disposal is completely silent, the issue might be electrical. Open your home’s circuit breaker panel and look for a tripped breaker — it will be in a middle position between ON and OFF. Flip it fully to OFF, then back to ON. Also check that the disposal is securely plugged into the outlet under the sink (some models use a standard plug). If your disposal is hardwired, make sure the switch on the wall is functioning by testing it with a voltage tester or plugging a lamp into the same outlet circuit.

Time needed: 2–5 minutes

Fix 3: Unjam the Grinding Plate with an Allen Wrench
Easy

If the disposal hums but doesn’t spin, something is jamming the grinding plate. Turn off the disposal and unplug it or switch off the breaker. Insert a 1/4-inch Allen wrench (hex key) into the hex socket on the very bottom center of the disposal unit. Work it back and forth several times to free the jammed impellers. Most disposals come with an Allen wrench designed for this purpose — check the cabinet under the sink. Once the flywheel turns freely, remove the wrench, restore power, run cold water, and test the disposal.

Time needed: 3–5 minutes

Fix 4: Remove a Jam from the Top Using Tongs or Pliers
Medium

Sometimes debris is visible inside the disposal opening. Turn off the unit completely and never put your hand inside the disposal. Use a flashlight to look down the drain and identify what’s causing the jam — common culprits include bones, fruit pits, silverware, or glass shards. Use long-handled tongs or needle-nose pliers to carefully reach in and pull out the obstruction. After removing the debris, use the Allen wrench technique from Fix 3 to confirm the flywheel moves freely, then restore power and test with running cold water.

Time needed: 5–10 minutes

Fix 5: Clear a Clogged Drain Line
Medium

If the disposal runs but water backs up into the sink, the problem is likely a clog in the drain pipe rather than the disposal itself. Turn off the disposal and disconnect the discharge pipe from the side of the unit using pliers — have a bucket underneath to catch water. Check for food buildup inside the pipe and clean it out. You can also use a sink plunger over the disposal drain opening (with water in the sink) to force the clog through. Avoid chemical drain cleaners as they can damage disposal components and corrode pipes over time.

Time needed: 10–20 minutes

Fix 6: Fix a Leaking Disposal
Medium

Leaking can happen at three points: the sink flange at the top, the dishwasher connection on the side, or the discharge pipe at the bottom. Place dry paper towels around the unit and run water to pinpoint the leak. If it’s at the flange, tighten the mounting bolts or replace the plumber’s putty seal. For a side connection leak, tighten the hose clamp on the dishwasher inlet. For a discharge pipe leak, tighten the screws holding the pipe to the disposal. If the disposal body itself is cracked, the unit will need to be replaced entirely.

Time needed: 15–30 minutes

Fix 7: Clean the Disposal to Restore Performance
Easy

A disposal that works but produces bad odors or grinds poorly may just need a deep clean. Drop a handful of ice cubes and a half cup of rock salt into the disposal, then run it with cold water for 30 seconds — this scrapes buildup off the grinding elements. Next, cut a lemon or lime in half and grind the pieces to deodorize. For persistent buildup, pour half a cup of baking soda into the disposal, follow with a cup of white vinegar, let it fizz for 10 minutes, then flush with hot water. Do this monthly to prevent future issues.

Time needed: 5–10 minutes

Fix 8: Replace the Garbage Disposal
Hard

If your disposal is over 8–10 years old, makes grinding metal sounds even when empty, trips the breaker repeatedly, or has a cracked housing, it’s time for a replacement. Disposals range from $80 to $250 depending on horsepower and features. To replace it yourself, disconnect power at the breaker, detach the discharge pipe and dishwasher connection, twist the disposal off the mounting ring, and reverse the process with the new unit. If your new disposal uses the same mounting ring brand, the swap is straightforward. Otherwise, you’ll need to remove and replace the sink flange and mounting assembly as well.

Time needed: 45–90 minutes

The Bottom Line

In most cases, a garbage disposal that stops working just needs a quick reset or an Allen wrench to free a jam — these two fixes solve about 80% of disposal problems. Start with the reset button, then check for jams before moving on to electrical troubleshooting. If the motor doesn’t respond at all after these steps or the unit is leaking from the body, it’s time to call a plumber or replace the disposal entirely.