Short answer: If the disposal hums but does not spin, it is jammed: turn it off, free it with a 1/4-inch hex (Allen) wrench in the bottom center socket, press the red reset button and try again. If it makes no sound at all, press the reset button, wait, and check the breaker. Never put your hand in the disposal.
Quick diagnosis
| What you notice | Most likely cause | What to check | Call a pro? |
|---|---|---|---|
| Hums but does not spin | Jammed flywheel | Turn the bottom hex socket with an Allen wrench | If it will not free |
| No sound at all | Overload protector tripped, or no power | Press the red reset button under the unit | If power is fine and it still is dead |
| Runs but sink does not drain | Clog in the drain line past the disposal | Check the other sink side and the trap | Sometimes |
| Stops after a few seconds | Motor overheating or partial jam | Free the jam, let it cool 10 to 20 minutes | If it repeats |
| Leaks from the bottom | Internal seal failure | Look under the unit with a flashlight | Usually means replacement |
Hums but does not turn (jammed)
InSinkErator, the largest disposal manufacturer, gives these steps for most of its models:
- Turn the disposal switch off. Never put your hand inside the unit.
- Insert the Jam-Buster wrench or a standard 1/4-inch Allen wrench into the hole at the bottom center of the unit, under the sink.
- Work it back and forth until it turns freely in full circles.
- Press the small red reset button on the bottom. If it will not stay in, wait ten minutes and try again.
- Look into the chamber with a flashlight and remove any object with tongs or pliers.
- Run cold water and turn the disposal on.
No sound at all
The motor has an overload protector that trips when it overheats or jams. Press the red reset button. If nothing happens, InSinkErator suggests letting the unit cool for up to 20 minutes and then checking your breaker panel for a tripped breaker or blown fuse. Models with an air switch on the countertop should be unplugged for the same cooling time.
Runs but the sink will not drain
If the motor runs normally, the clog is in the drain pipe after the disposal or in the trap. See kitchen sink clogged.
When to call a professional
- The motor stays silent after reset and the breaker is on.
- The unit leaks from the bottom or the body.
- It keeps tripping the reset button or the breaker.
- You see scorch marks, smell burning or hear electrical buzzing.
What it usually costs
Freeing a jam costs nothing if you have an Allen wrench. A plumber visit typically starts with a call-out fee and $45 to $150 per hour, according to HomeGuide (2026).
Frequently asked questions
Where is the reset button on a garbage disposal?
On most models it is a small red or black button on the bottom of the unit, under the sink.
Why does my disposal hum and not turn?
Something is wedged between the turntable and the grinding ring. Turning the hex socket at the bottom frees it.
Related problems
Sources
- InSinkErator: Fixing a jammed garbage disposal
- InSinkErator: Garbage disposal won’t turn on or off
- Moen: How to unjam a garbage disposal
- HomeGuide: Plumber cost per hour (2026)
This guide is general information, not a substitute for an inspection by a licensed professional. See our disclaimer.