Garbage Disposal Not Working? Reset It, Unjam It, or Replace It

Why is my garbage disposal not working?

Listen to it first. That one detail tells you where to go next. A hum with no grinding means the motor has power and cannot turn, so something is jammed. Dead silence means either the overload protector under the unit popped out or power is not reaching the motor at all. If it runs fine but water stands in the sink, the disposal is doing its job and the drain past it is plugged.

Before anything else, turn the wall switch off. The manufacturer's instruction on this is blunt: "Do not place your hand in the garbage disposal at any time." Use a flashlight to look and tongs or pliers to pull things out. A spoon wedged against the impeller has no idea whether the switch is on.

Where is the reset button on a garbage disposal?

Underneath the unit, facing the floor. On InSinkErator disposals it is a small red square, and when the overload protector has tripped it sits down about a quarter of an inch, roughly 5 mm. Press it gently back up. If it will not stay up, the motor is still hot: the factory guidance is to leave the wall switch off and let it cool for up to 20 minutes, then try again (InSinkErator reset instructions).

The reset does not fix anything. It only puts the motor back in service after it protected itself. When a disposal trips again a minute later, the jam is still in there or the motor is on its way out.

What does it mean when a garbage disposal hums?

It is jammed, and every second you leave the switch on is heat going into a motor that cannot move. Shut it off.

Dead center on the bottom of the unit there is a hex socket. A standard 1/4 inch Allen wrench fits it, and most disposals ship with a short offset wrench for exactly this. Work it back and forth in both directions until the shaft turns in full circles with no resistance. Then press the reset button, shine a light in the grinding chamber, lift out whatever came loose, run cold water, and flip the switch.

The usual culprits are chicken and pork bones, fruit pits, a bottle cap that went in with the rinse water, and anything stringy. Celery, corn husks, and artichoke leaves wrap around the impellers like rope. Potato peels and cooked rice do something different: they pack into a paste that the grind plate cannot throw off.

The disposal is silent, so is it the breaker or the unit?

Go in order and you will not waste a trip charge. Reset button first. Then the breaker, and flip it all the way off and back on, because a tripped breaker can sit looking almost closed. Then the switch itself.

Some disposals are hard wired straight to the wall switch, but plenty plug into an outlet inside the cabinet, and that is the easy one to test. Unplug the disposal and plug a lamp or a night light into the same outlet. If the lamp goes on and off with the wall switch, the outlet and switch are fine and the disposal needs service. If the lamp does nothing, the fault is in the wiring, and that is an electrician's job rather than ours (manufacturer troubleshooting steps).

What should never go down a garbage disposal?

Grease, and it is not close. A disposal does nothing about fat except cut it into smaller pieces. The City of Vallejo's wastewater utility puts it plainly: "Home garbage disposals do not keep grease out of the plumbing system. They shred solid material into smaller pieces, but do not prevent grease from going down the drain" (City of Vallejo, discharge to the sewer). That fat cools a few feet down the line, sticks to the pipe wall, and starts catching everything that comes after it.

Thanksgiving week is when this catches up with people, and Santa Rosa Water and the fire department put out the same reminder every November: wipe small amounts up with a paper towel, and for anything up to about two cups, let it cool and harden in a sealed container before it goes in the trash (Santa Rosa grease disposal guidance). Turkey drippings and leftover gravy count.

Coffee grounds are the other one worth naming. They sink and settle in the trap instead of flushing through, and on an older Sonoma County house with cast iron or galvanized drain lines they build up against pipe that is already narrowed with scale.

When is the disposal worth replacing instead of fixing?

Water dripping from the body of the unit, between the top and bottom halves, is the end of it. The grinding chamber has rusted through from the inside and no sealant will hold. A drip at the sink flange or at the drain elbow is a different story and usually a gasket or a loose slip nut.

Replace it too when the reset trips over and over with nothing jammed in the chamber, or when the motor turns but barely chews soft food. Bearings wear out. We swap disposals as part of our faucet and fixture repair work and check the drain connection and the dishwasher inlet while the unit is off the sink, since the knockout plug on a new disposal has to come out or the dishwasher will back up into the cabinet.

If the wrench spins freely and the motor runs but the sink still fills, stop working on the disposal. The blockage is in the trap or the branch line, and clearing a single fixture drain runs $125 to $350 at our shop, quoted before we start. Call (707) 308-5599 and we will tell you over the phone whether it sounds like a jam you can clear yourself in ten minutes.