Disposal Jammed, Humming or Leaking?
A disposal that hums, leaks or smells usually has a simple cause. Call, and a plumber serving your area will clear the jam, fix the leak or replace the unit.
- Licensed and insured plumbers
- Same-day service when available
- 24/7 emergency dispatch
What the Symptom Means
Disposals give clear signals.
| Symptom | Cause | Direction |
|---|---|---|
| Hums, does not spin | Jammed blades | Clear the jam |
| Nothing, no hum | Tripped reset or a dead motor | Press reset, check power |
| Leaks from the top | Sink flange seal | Reseal or replace the flange |
| Leaks from the side | Drain or dishwasher hose | Tighten or replace the connection |
| Leaks from the bottom | Failed internal seal | Replace the disposal |
| Slow drain through it | Clog in the drain line | Clear the line |
Clearing a Jam Safely
A stuck, jammed or humming unit all point to the same cause. Turn the power off at the switch and unplug the unit or cut the breaker. Never reach into the chamber. Look for the hex socket on the underside of the unit and turn it back and forth with the matching wrench until the blades move freely. From above, a wooden spoon handle works the same way. Remove the item with tongs, then press the red reset button on the bottom and test with water running.
Disposal flooding the sink?
Turn off the unit and the water, and call. A plumber gets dispatched when the schedule allows.
Smells and Clogs
A smell usually means food residue coating the chamber. Ice cubes and citrus peels help a little, and a plumber can clean the unit. A sink that backs up when the disposal runs points to a drain clog downstream, which the drain cleaning and clogs page covers. Grease is the usual culprit, and it does not belong in the disposal or the drain.
Replacing a Disposal
The plumber disconnects the electrical supply, removes the old unit from its mounting, checks the sink flange and the drain, mounts the new unit and reconnects the drain and the dishwasher line. Horsepower, feed type and noise insulation differ between models. A continuous feed unit runs with a wall switch, and a batch feed unit runs when the stopper is in place.
Dishwasher and Air Gap
A dishwasher drain usually connects at the disposal, and a knockout plug must be removed on a new unit before the hose connects. Water that backs into the dishwasher or leaks from the air gap points to a blocked drain or a connection that was not opened. A plumber checks both when installing.
Disposal giving up?
Say what it does when switched on. You will hear whether it can be fixed or replaced.
What Goes Down and What Does Not
A disposal grinds soft food scraps and sends them down the drain with water. It is not a trash can.
- Run cold water before, during and for several seconds after grinding.
- Feed small amounts at a time rather than a full load.
- Keep grease, oil and fat out, since they cool and coat the drain.
- Keep bones, fruit pits, corn husks and fibrous stalks out of it.
- Never put glass, metal, plastic or cleaning cloths in it.
- Skip chemical drain cleaners, which can damage the unit and are hazardous.
Reset, Power and Switch Checks
If nothing happens at all, check the simple things first. Press the red reset button on the bottom of the unit. Check the wall switch and the circuit breaker. Look at the plug under the sink if the unit is cord connected. A unit that trips the breaker each time points to a jam or a failing motor, and repeated resets are not a fix. A plumber tests the motor and the connection before recommending replacement.
Choosing Horsepower and Features
Horsepower affects how well a unit handles tougher scraps and how long it runs without bogging down. Smaller units suit light use, and larger ones suit households that cook often. Look at the grind stage, the mounting system and how well the unit is insulated for sound. Ask whether it comes with the power cord and the mounting hardware, and whether the existing sink flange can be reused.
When a Disposal Is Not the Real Problem
A sink that drains slowly even with the disposal off has a clog beyond it. A dishwasher that smells may have a blocked drain hose. A cabinet that stays wet may have a leaking supply line and not a disposal leak at all. Checking the whole sink area keeps the repair focused on the part that failed.
If the water pools and the whole house drains slowly, stop using the sink and see the sewer line repair page for the signs of a main line problem.
A Disposal That Is Stuck or Backed Up
A disposal that is stuck will not turn when the switch is on. A backed up sink that fills when the disposal runs has a clog beyond the unit. Check whether the dishwasher drain is also backing up. If water rises in the other side of a double sink, the line downstream is blocked, and a plumber clears it before the disposal is blamed.
Garbage Disposal Questions
Why is my disposal humming but not spinning?
The blades are jammed. Turn off the power, then use the hex key slot under the unit to loosen them, or turn the blades with a wooden spoon handle from above. Never put your hand inside.
What should never go in a disposal?
Grease, coffee grounds in large amounts, fibrous vegetables, bones, pits and non food items. They clog the drain or jam the unit.
Why is the disposal leaking?
From the top, a worn sink flange seal. From the side, a loose hose or the dishwasher connection. From the bottom, a failed internal seal, which means replacement.
How long does a disposal last?
It varies with use and what goes in. A unit that jams often, leaks from the body or trips the breaker is likely ready to replace.
Can I install one myself?
It involves electrical, plumbing and a sink connection. A plumber handles it quickly and checks the drain at the same time.
Disposal still jammed?
Get dispatch on the line and say whether it hums or leaks. A plumber serving your area can clear or replace it.