If you’ve already pressed the reset button and the disposal still won’t run, the button may have done its job, or the problem is something else entirely. The reset button trips when the motor overheats. If it trips again immediately, or nothing happens at all, you’re dealing with more than a one-button fix.
What the Reset Button Actually Does
Your disposal has a small thermal overload protector, usually a red (sometimes black) button on the bottom of the unit. When the motor overheats, it trips this breaker and cuts power to itself. You press it, it clicks back in, the motor cools down, and the unit runs again.
That’s the normal scenario. “The reset button isn’t working” usually means one of three things: the button pops right back out as soon as you push it, the button stays in but nothing happens when you flip the switch, or the button already looks like it’s in but the disposal is still dead. Each of those points to a different root cause.
Most Likely Cause First: The Motor Is Still Hot
Give it 15 minutes. If you jammed the disposal, ran it dry, or cycled the switch a few times trying to get it to run, the motor is hot. The reset button won’t stay in until the thermal overload cools.
Wait, then try again. If the button clicks in and stays but the unit hums without spinning, the flywheel is jammed, not the motor. That’s something a licensed plumber can diagnose and clear quickly.
Check the Outlet First
This gets skipped constantly. Disposals are usually wired to an outlet under the sink, or hardwired to a switch. If the outlet itself lost power, pressing the reset button all day won’t do anything.
Plug something else into that outlet to test it. If it doesn’t work either, check your main panel. A tripped GFCI outlet somewhere upstream can also kill power to your disposal without touching the breaker.
GFCI outlets are the ones with “test” and “reset” buttons, found in kitchens, bathrooms, and garages. Find any tripped GFCI (the reset button will be popped out slightly), press reset, then go back and test the disposal outlet again.
If a GFCI keeps tripping after you reset it, that points to a ground fault in the circuit. That needs a licensed electrician or plumber, not another reset attempt.
If the Outlet Has Power and the Button Stays In
Now you’re looking at the motor. There are two possibilities.
The motor is seized. Older motors sometimes lock up mechanically. You’ll often hear a faint hum when the switch is on, or nothing at all.
The motor is dead. No hum, no click, nothing. The motor windings have failed and the unit is done. There’s no home fix for a burned-out motor. Replacement is the path forward.
Either way, you’re past what you can safely check yourself. The motor, the wiring, and any replacement work all need a licensed plumber.
Checks You Can Do Before Calling
- Wait for the motor to cool and retry the reset button
- Test the outlet with another device
- Find and reset any tripped GFCI in the kitchen or garage
Those are the safe stops. Everything beyond that, including anything inside the unit or under the sink, is a job for a licensed plumber.
When to Call a Licensed Plumber
If the disposal is dead, jammed, or the reset keeps tripping, call a licensed plumber. They handle disposal replacement routinely because the job touches both the drain plumbing and the electrical connection.
Before you hire anyone, check their license at cslb.ca.gov. A valid license number takes about 30 seconds to verify and shows whether their bond and insurance are current. Getting quotes from a couple of licensed plumbers is worth it since prices vary for this kind of work.