A jammed garbage disposal almost always has a simple fix — a piece of hard food or debris has locked the grinding plate, and you can usually free it in under five minutes without calling a plumber. A clogged disposal (where water backs up but the motor hums or runs) is a different issue and points to a drain blockage downstream. Both are manageable, but the first rule for either situation is the same: never put your hand into the disposal, even when you’re sure it’s off.

First: Identify Whether It’s a Jam or a Clog

When you flip the switch and hear nothing — no hum, no motor — the disposal has tripped its built-in thermal overload protector. That’s a jam. The motor detected resistance, overheated, and shut itself off as a safety measure. When you flip the switch and the motor runs but water won’t drain, or water backs up into the other sink basin, that’s a clog in the drain line — the grinding plate is spinning freely, but waste has nowhere to go. Each problem has a different fix.

How to Clear a Jammed Disposal

Turn off the disposal switch and unplug the unit under the sink (or flip the circuit breaker if it’s hard-wired). Look at the bottom of the disposal housing — there’s a hex socket in the center. Most disposals come with a small hex wrench (Allen key) for this purpose; if yours is gone, a standard 1/4-inch Allen key works on most models. Insert the wrench and work it back and forth until you feel the plate break free and turn a full rotation. Once it moves freely, remove the wrench.

Now use disposal tongs or pliers — never your fingers — to reach into the drain opening and remove whatever caused the jam. Common culprits include fruit pits, small bones, bottle caps, and broken glass. Once cleared, press the red reset button on the bottom of the unit, restore power, run cold water, and test. If it trips again immediately, something is still lodged or the motor is failing.

How to Clear a Clogged Disposal Drain

If water is backing up and the motor runs fine, the blockage is in the drain trap or further down the line. Start by turning the disposal off. Place a bucket under the P-trap (the curved pipe section under the sink) and unscrew the slip-joint nuts by hand or with slip-joint pliers. Remove the trap and clear any buildup inside it — grease, food sludge, and mineral deposits from Colorado’s hard water are common culprits. Reinstall, run water, and check for leaks at the joints.

If the trap is clear but water still backs up, the blockage is deeper in the drain line and may require drain cleaning tools or a professional.

  • Always run cold water while operating the disposal — cold water solidifies grease so it grinds rather than coats the drain walls
  • Never use chemical drain cleaners in a disposal — they corrode the rubber components
  • Never put fibrous foods (celery, artichoke), starchy foods (potato peels), or large amounts of grease down the disposal
  • After clearing a jam, run the disposal with water for 30–60 seconds to flush debris through
  • A disposal that jams repeatedly may have worn grinding rings and need replacement

When to Call a Plumber

Call a plumber if the motor hums but won’t turn even after using the hex wrench and resetting, if you hear grinding or rattling during normal operation (something hard may be permanently lodged against the plate), or if the unit leaks from the mounting flange or the side connections. Disposals that repeatedly jam, trip the reset button, or are more than 10–12 years old are usually better replaced than repaired.

If the clog is beyond the trap and your drain snake isn’t reaching it, Done’s drain team can clear it quickly. Learn more about our drain cleaning services or our kitchen plumbing services — we’re available throughout the Denver metro when you need fast, reliable help.