Start with the simplest fixes first
Most garbage disposal problems stop at the circuit breaker or the reset button, not inside the unit itself. Before you assume the disposal is broken, check that the breaker controlling it hasn't tripped—look at your electrical panel for any switch in the middle position or a different color than the others. If the breaker is fine, locate the red or black reset button on the bottom of the disposal unit (underneath the sink) and press it firmly. Wait a few seconds, then try running the disposal again.
If the disposal still won't turn on, make sure the wall switch is actually working. Flip it on and off several times. Some switches wear out and stop making contact. If you have a dishwasher connected to the same disposal, check that the dishwasher's drain valve is open and not blocking water flow into the unit.
Key Takeaways
- Reset the disposal by pressing the red or black button on the bottom of the unit, then check your circuit breaker before assuming the motor is dead.
- A jammed disposal usually makes a humming sound but won't spin; turn off the power and use tongs or pliers to remove the blockage—never put your hand down the drain.
- Slow draining often comes from grease buildup or food stuck in the drain line, not the disposal itself, and can be cleared with hot water or a plunger.
- Leaks at the seals or connections need the disposal to be turned off and the area dried before you can see exactly where water is escaping.
- Foul smells usually mean old food is stuck in the chamber; run the disposal with cold water and ice cubes, then follow with hot water and dish soap.
What to do when the disposal hums but won't spin
A humming sound means the motor is trying to run but something is blocking the blades from turning. Turn off the disposal when ready—do not keep trying to start it, as this can burn out the motor. Flip the wall switch to off and also switch off the circuit breaker controlling the unit.
Once the power is completely off, use a flashlight to look down the drain opening. You will likely see a piece of silverware, bone, glass, or a hard object wedged between the blades or against the chamber wall. Use needle-nose pliers or tongs to grab and remove it. Never reach your hand into the disposal, even when the power is off, because the blades are sharp and someone else could accidentally turn it on.
After you remove the blockage, turn the power back on and run cold water while you start the disposal. It should spin freely now. If it still hums without spinning, the motor may be damaged and the unit will need to be replaced.
Clearing a slow drain or complete blockage
If water backs up into the sink or drains very slowly, the problem is usually not the disposal itself but the drain line downstream. Food particles and grease can build up in the P-trap or the pipe leading to the main drain. Start by filling the sink with a few inches of water, then use a plunger over the drain opening and pump it vigorously 15 to 20 times. This pressure can dislodge soft blockages.
If the plunger doesn't work, try pouring a kettle of boiling water down the drain while the disposal is off. Hot water can melt grease that has hardened in the pipes. Let it sit for 10 minutes, then run cold water for 30 seconds. If the drain is still slow, you may need to remove and clean the P-trap under the sink—place a bucket underneath first to catch water, then use a wrench to loosen the connections and pull out any debris.
Do not use chemical drain cleaners on a disposal system. They can damage the rubber seals inside the unit and create toxic fumes if they mix with other substances in the pipes.
Stopping leaks at the seals and connections
Water dripping from under the disposal usually comes from one of three places: the seal where the disposal connects to the sink, the connection to the drain line, or a crack in the disposal chamber itself. Turn off the power at the breaker and let the area dry completely so you can see exactly where the water is coming from.
If water is leaking from the top seal (where the disposal meets the sink), the rubber gasket has likely worn out. You will need to remove the disposal, replace the gasket, and reinstall it—this is a job for a plumber unless you are comfortable working with plumbing connections. If the leak is at the drain line connection (the pipe coming out the side of the disposal), tighten the hose clamp with a screwdriver. If that does not stop it, the connection may need to be resealed with plumber's putty or replaced.
A crack in the disposal chamber itself cannot be repaired and means the unit must be replaced.
Fixing bad smells coming from the disposal
Foul odors mean old food is decaying inside the chamber. Turn on the cold water and run the disposal for 10 to 15 seconds to flush out loose debris. Then fill the sink with cold water, add a handful of ice cubes, and run the disposal again. The ice helps scour the chamber walls and dislodge stuck food particles.
After the ice cycle, turn off the disposal and pour a cup of baking soda down the drain, followed by a cup of white vinegar. Let this mixture sit for 15 minutes—it will fizz and bubble, which is normal. Then run hot water for 30 seconds while the disposal is off to flush it out. Finally, turn on the disposal and run it with hot water and a squirt of dish soap for 10 seconds.
To prevent odors from returning, run the disposal with cold water for a few seconds after each use, and once a week repeat the ice and baking soda treatment.
When the disposal makes strange noises
A grinding or rattling sound that is different from the normal operation noise usually means something is loose inside the unit or a foreign object is bouncing around in the chamber. Turn off the disposal and look down the drain with a flashlight. Remove any visible objects with pliers or tongs.
If you do not see anything and the noise continues, the blades or the motor mounting may be damaged. A plumber or the disposal manufacturer can inspect it, but in most cases a noisy disposal that still works is safe to keep using until it fails completely. However, if the noise is a high-pitched squeal, the motor bearing may be wearing out and the unit should be replaced soon to avoid a sudden failure.
Knowing when to call a plumber instead of troubleshooting
You can handle reset buttons, removing jams, and clearing slow drains on your own. But if the disposal won't turn on after you have checked the breaker and reset button, if it leaks from the top seal, if it makes a high-pitched squeal, or if you cannot identify where a leak is coming from, a plumber should look at it. Trying to disassemble the unit yourself can damage internal parts and make the repair more expensive.
If the disposal is more than 10 years old and needs a major repair, replacement is often cheaper than fixing it. A new disposal costs between $150 and $400 depending on the model, plus installation labor. A plumber can help you decide whether repair or replacement makes sense for your situation.
Frequently Asked Questions
Can I use my garbage disposal if it leaks a little bit?
A small leak may seem harmless, but water under the sink can rot the cabinet and damage the floor. Even a slow leak should be fixed. Tighten the hose clamp at the drain connection first—if that does not stop it, the seal or gasket needs to be replaced.
What should I never put down a garbage disposal?
Avoid bones, fruit pits, shells, hard candy, glass, metal, and fibrous foods like celery or corn husks. Grease and oil should also go in the trash, not down the drain, because they harden in the pipes and cause blockages downstream.
How often should I clean my garbage disposal?
Run it with cold water for a few seconds after each use. Once a week, run the ice and baking soda treatment to keep the chamber clean and prevent odors. This takes about 20 minutes total and keeps the disposal working well.
Is it safe to reach into the disposal to get something out?
No. Even with the power off, the blades are sharp and someone else could turn it on. Always use pliers or tongs to remove objects, and make sure the power is off at both the wall switch and the circuit breaker.
Why is my disposal leaking from the bottom?
A leak from the bottom usually means there is a crack in the chamber or the seal at the drain connection is worn out. Tighten the hose clamp first. If water still drips, the disposal likely needs to be replaced, as internal cracks cannot be sealed.