Garbage Disposal Jammed or Humming? How to Fix It Safely
Your garbage disposal is humming but nothing's happening — or worse, it's completely silent. A jammed garbage disposal is a familiar kitchen problem, and the good news is that it's usually a quick DIY fix. Here's how to handle it safely.
Safety First
Never put your hand inside a garbage disposal. Even when it's off, the blades are sharp and the unit could accidentally turn on. Always use tools, not fingers, to clear jams.
Scenario 1: Disposal Hums But Doesn't Spin
A humming disposal means the motor is getting power but the flywheel is stuck. Don't leave it humming — switch it off straight away, because a stalled motor overheats quickly.
Step 1: Turn Off the Power
Switch off the disposal at the wall switch. For extra safety, unplug it under the sink or turn off the circuit breaker.
Step 2: Use the Allen Wrench
Most disposals have a hex socket on the bottom center. Insert a 1/4-inch Allen wrench (many disposals come with one) into this socket and work it back and forth. This manually rotates the flywheel and dislodges whatever is stuck. You should feel resistance, then a release.
Step 3: Use a Disposal Wrench or Wooden Handle
If there's no hex socket, insert a wooden broom handle into the disposal from the top and push against the impeller blades to rotate them. Never use metal tools from the top — they can damage the grinding components.
Step 4: Remove the Obstruction
Use tongs or needle-nose pliers to reach in and remove whatever caused the jam. Common culprits include bones, fruit pits, glass, utensils, and fibrous foods like celery.
Step 5: Reset and Test
Press the red reset button on the bottom of the disposal unit. Turn the water on, then flip the switch. The disposal should run freely.
Scenario 2: Disposal Won't Turn On at All
If the disposal is completely silent — no hum, no sound — the issue is electrical:
- Press the reset button: The thermal overload may have tripped. Wait 5 minutes for it to cool, then press the red reset button on the bottom of the unit.
- Check the outlet: Plug something else into the same outlet (or the outlet the disposal is plugged into under the sink) to verify power.
- Check the circuit breaker: The breaker may have tripped. Look for a tripped breaker in your electrical panel.
- Check the wall switch: Disposal switches can wear out. If the switch feels loose or doesn't click, it may need replacement.
Scenario 3: Disposal Leaks
Leaks can come from three places:
- Top (sink flange): The mounting ring or plumber's putty has failed. The disposal needs to be removed and resealed.
- Side (dishwasher connection): The hose clamp connecting the dishwasher drain may be loose.
- Bottom (unit itself): An internal seal has failed. This usually means the disposal needs replacement — they're not economically repairable when leaking from the bottom.
To find which, dry the unit with a towel, put a few drops of food coloring in a sink of water, pull the plug and watch with a flashlight. The first place colored water appears is the source.
Scenario 4: It Runs, But the Sink Drains Slowly
A disposal that spins freely but leaves the sink full has a clog, not a jam — usually in the drain line or trap after the disposal, where ground food and grease have settled. Run the disposal with plenty of cold water for a little longer after the food is gone, so the waste is carried all the way through. Don't pour chemical drain cleaners into a disposal: they can damage the seals and splash back on whoever opens it next. If the trap under the sink is blocked, it can be removed and cleared with a bucket underneath; a clog further into the wall is a plumbing job.
If the Dishwasher Drains Through the Disposal
Most dishwashers empty into the disposal through a hose on its side, so a disposal problem often shows up as a dishwasher problem. A clogged disposal inlet, a jam, or a new disposal installed without knocking out the dishwasher inlet plug will all leave dirty water in the dishwasher. If yours has started holding water, read the checks for a dishwasher that will not drain — the disposal connection is one of the first.
Bad Smells
Odors come from food stuck under the rubber splash guard and on the walls of the grinding chamber. With the power off, lift the splash guard flaps and scrub underneath with an old toothbrush and dish soap. Grinding a few ice cubes, or ice with a little coarse salt, helps scour the chamber. Citrus peel freshens it, but in small pieces only. A smell that comes back within a day may be coming from the drain line rather than the disposal.
Foods to Never Put in a Garbage Disposal
- Grease and oil: Solidifies and clogs pipes
- Pasta and rice: Expands with water and creates blockages
- Coffee grounds: Accumulates in pipes like sediment
- Fibrous vegetables: Celery, asparagus, and corn husks wrap around blades
- Bones (large): Small chicken bones are fine; beef bones and pork chops are not
- Eggshells: Contrary to popular belief, they don't sharpen blades — they create granular waste that clogs
- Fruit pits: Too hard for the grinding mechanism
When to Replace vs. Repair
How long a disposal lasts depends on how hard it is used, what goes into it and how well it was installed. Consider replacement if:
- It jams frequently despite clearing
- It leaks from the bottom
- It takes much longer to grind food than it used to
- It's an older unit with rust on the body and needs a repair
RapidFix can install a new disposal or repair your existing one. Call (754) 888-5560 for service.
A disposal that hums is usually jammed; one that does nothing at all is usually electrical, and that is where the DIY ends. See everything we repair, and what it costs before anyone is dispatched.