A humming garbage disposal that won’t grind is a common—and frustrating—kitchen problem. Before you call a plumber, there are a few simple troubleshooting steps you can try to get your disposal working again. In this guide, we’ll walk you through the most likely causes of a humming disposal and how to fix them safely.
Why Is My Garbage Disposal Humming?
When your disposal hums but doesn’t spin, it usually means the motor is running, but something is preventing the blades from turning. The most common causes include:
✅ A jammed impeller (the spinning plate inside)
✅ Food debris stuck in the grinding chamber
✅ A foreign object lodged in the disposal
✅ A tripped reset button
Read this visual guide published by the Spruce to learn the parts of a garbage disposal.
Step-by-Step Fixes for a Humming Garbage Disposal
1. Turn Off the Power
Safety first! Before doing anything, unplug the disposal or turn off its circuit breaker to prevent accidental activation.
2. Press the Reset Button
Most disposals have a small red reset button on the bottom. If it’s popped out, press it to restore power.
3. Check for a Jam
Use an Allen wrench (usually included with the disposal) to manually turn the motor from the bottom. Insert it into the center hole and rotate back and forth to free any obstructions.
4. Remove Visible Blockages
If you can see food or debris inside, use tongs (never your hands!) to carefully remove it.
5. Test the Disposal
Once cleared, restore power and run cold water while turning on the disposal. If it still hums, there may be a deeper issue.
When to Call a Professional
If your disposal still won’t work after these steps, you may have:
🔧 A burned-out motor
🔧 Electrical issues
🔧 A damaged flywheel or impeller
In these cases, it’s best to call a professional plumber. Our expert plumbing services team can diagnose and repair your disposal quickly and safely.
How do you fix a garbage disposal that hums?
A humming sound usually means the disposal is getting power but the blades are jammed. First, turn off the power and check for any obstructions like food scraps, bones, or utensils. You can use an Allen wrench in the bottom slot (under the unit) to manually rotate the blades and free the jam. Once cleared, restore power and try turning it on again.
How do I get my garbage disposal to spin again?
If your disposal isn’t spinning, it could be jammed or overheated. First, press the reset button on the bottom of the unit. Then, use a hex key to manually rotate the impellers and dislodge any stuck debris. After clearing the jam and resetting the unit, turn it back on and test it.
How long do you hold the reset button on a garbage disposal?
You only need to press the reset button once firmly—it doesn’t need to be held down. When the button stays pushed in, it means the reset has been successful. If it pops out again right away, there may still be a jam or the motor could be overheated.
Why is my garbage disposal spinning but not draining?
If your disposal spins but water isn’t draining, the problem is likely a clog in the drain pipe—not the disposal itself. Food particles or grease may be blocking the plumbing just past the disposal unit. Try running water while plunging the sink or using a drain snake to clear the blockage. Avoid using chemical drain cleaners, as they can damage the unit.
How to Prevent Future Jams
To avoid humming and clogs, never put these items in your disposal (check our full guide on What Not to Put in a Garbage Disposal):
🚫 Grease or oil
🚫 Fibrous vegetables (celery, potato peels)
🚫 Coffee grounds
🚫 Eggshells
🚫 Bones or fruit pits
Final Thoughts
A humming garbage disposal is usually an easy fix—but if DIY methods don’t work, don’t force it! Let our licensed plumbers handle the repair to prevent further damage.
