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    Drains & SewerMay 26, 2026 5 min readBy Mountain Time Plumbing

    Garbage Disposal Not Working? Try This Before Calling a Plumber

    A simple troubleshooting checklist for jammed, humming, or completely dead garbage disposals, and when to stop and call a pro.

    A dead garbage disposal usually isn't a dead garbage disposal. Before you replace the whole unit, or pay for a service call, run through this short checklist. Half the disposals we're called out to look at in Boise just need a 90-second reset.

    Step 1: Is It Completely Silent?

    If you flip the switch and hear absolutely nothing, no hum, no click, the unit has tripped its internal overload protector.

  1. Look under the sink at the bottom of the disposal.
  2. Find the small red reset button centered on the bottom.
  3. Press it firmly. If it clicks in and stays, the overload was tripped.
  4. Try the switch again.
  5. If it still does nothing, check the kitchen breaker and the GFCI outlet (often in the cabinet or on a nearby wall). Reset both if needed.

    Step 2: Does It Hum But Not Spin?

    A humming, non-spinning disposal has a jammed impeller. The motor is trying to turn but something is locking it.

  6. Turn the disposal switch off.
  7. Look for a hex-shaped slot at the very bottom center of the unit. Most disposals ship with a small jam-wrench (¼" Allen key) for this.
  8. Insert the wrench and rotate it back and forth a few times in both directions until you feel the impeller spin freely.
  9. Press the reset button.
  10. Run cold water and try the switch in short bursts.
  11. Common culprits: chicken bones, fruit pits, twist-ties, silverware. If you can see the obstruction, use tongs or pliers, never your hand, even with the switch off.

    Step 3: Slow Drainage After Running

    If the disposal runs fine but water backs up in the sink, the problem isn't the disposal. It's the drain line downstream. Try cleaning the P-trap underneath, or call us for professional drain cleaning. In Treasure Valley homes with hard water, mineral buildup in the line is a common cause.

    Step 4: Leaking

    Leaks at the top usually mean a worn sink flange or putty seal. Leaks from the bottom mean the internal seals have failed, that disposal is at the end of its life and needs replacement. Side leaks at the discharge or dishwasher inlet are usually a loose hose clamp.

    What to Never Do

  12. Never reach into a disposal with your hand.
  13. Never run hot water while grinding. It liquifies grease and pushes it down the line.
  14. Never put fibrous, starchy, or expanding foods (celery, potato peels, pasta, rice, coffee grounds) into the unit.
  15. Never use chemical drain cleaners in a disposal. They damage seals and corrode the impeller.
  16. When to Call Mountain Time Plumbing

    If the reset and unjam steps don't work, the unit is leaking from the bottom, or you're getting a burning smell, call us. We replace garbage disposals across Boise, Meridian, Eagle, Kuna, Nampa, and the rest of the Treasure Valley, usually the same day. Call (208) 993-0717.

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