If your garbage disposal won't turn on, the cause is usually one of three things: it's jammed (it hums but won't spin), it tripped its reset button or lost power (it's completely silent), or the internal motor or switch has failed. The good news is that the two most common causes are quick fixes you can often handle yourself in a few minutes. Here's how to diagnose and safely fix it.
First, Which Symptom Do You Have?
- It hums but doesn't spin: the disposal is jammed.
- It's completely silent: it lost power or tripped the reset.
- It clicks or does nothing at all: could be the switch, wiring, or a failed motor.
If It Hums but Won't Spin (a Jam)
A humming disposal has power but something is stuck between the impeller and the grind ring. Turn it off at the wall switch first – never put your hand inside. Then use the hex (Allen) wrench that came with the unit in the socket on the bottom center, turning it back and forth to free the jam. Remove any visible debris from the top with tongs, wait a few minutes for the motor to cool, and try again.
If It's Completely Silent (No Power)
Press the small red reset button on the bottom of the disposal – it pops out when the motor overloads. If that doesn't work, check your breaker panel for a tripped breaker and confirm the switch and any outlet the disposal plugs into have power. These simple checks solve most "dead" disposals.
When It's Time to Call a Plumber
If you've freed the jam, pressed the reset, and confirmed power – and it still won't run – the motor, switch, or wiring has likely failed. Persistent leaks, burning smells, or a unit that keeps tripping the breaker also mean it's time for a professional. In many cases, replacing an old disposal is more cost-effective than repeated repairs, and we'll give you an honest recommendation.
Garbage Disposal FAQ
Why does my disposal only hum?
A hum with no spinning means it's jammed. Cut the power, free the jam with the hex wrench in the bottom socket, and clear any debris – it should run again once the obstruction is gone.
Where is the reset button on a garbage disposal?
It's a small red (sometimes black) button on the bottom center of the unit. If the motor overloaded, it pops out; pressing it back in restores power.
Is it worth repairing an old garbage disposal?
Jams and resets are free or cheap to fix. But if the motor has burned out or it leaks from the body, replacement is usually the better value since a new unit is relatively inexpensive.
Disposal Still Won't Run? We Can Help
If the basic fixes didn't work, don't force it. Az Express Plumbing repairs and replaces garbage disposals across San Tan Valley with upfront pricing. Learn more on our garbage disposal page, or call (480) 771-7519.
