Garbage Disposal Repair and Installation
A disposal that hums is jammed, not dead. A disposal that leaks from the bottom is dead. Knowing which is which is the difference between a five-minute fix and a new unit.
We clear jams, reset units, diagnose leaks and fit replacements with new drain fittings and a proper dishwasher connection.
What the symptoms mean
Disposals are simple machines and their faults map neatly onto symptoms. Reading them correctly avoids replacing a working unit.
It hums but does not turn. The motor has power and the grinding plate is jammed. Almost always something wedged between an impeller and the shredder ring, a bone fragment, a cherry pit, a bottle cap, a piece of cutlery. The unit will trip its thermal overload shortly. This is a clearable fault, not a failure.
Nothing at all, no hum. Either the thermal overload has tripped and needs its reset button pressed, or there is no power, a breaker, a switch, a wall outlet under the sink, or a failed switch. Occasionally the motor has genuinely died.
It runs but grinds poorly and backs up. Usually not the disposal. Worn impellers are possible on a very old unit, but a slow drain with a functioning motor points at the trap or the branch drain.
It rattles loudly. Something metal in the chamber, a spoon, a ring, a screw. Stop and retrieve it before it damages the shredder ring.
It leaks. Where from matters entirely, and the next section covers it.
A persistent smell. Food residue in the chamber and under the splash guard. A clean rather than a repair, and the splash guard underside is the part everyone misses.
Clearing a jam safely
This is a job a homeowner can do, and we would rather explain it than charge for it.
Switch the disposal off at the wall switch, and if you are reaching in, switch off the breaker as well. Never put a hand into the chamber with power available, every serious disposal injury involves an assumption that the switch was off.
Most units have a hex socket in the center underneath, and they ship with a small allen key for exactly this. Fit the key and work the plate back and forth until it turns freely. Alternatively, a broom handle against an impeller gives the same leverage from above.
Then look into the chamber with a torch and retrieve whatever caused it, with pliers or tongs, not fingers. Press the red reset button on the underside, restore power, and run cold water while switching on briefly.
When to stop and call: the plate will not free up, the unit trips its reset repeatedly, there is any water where it should not be, or the wiring is involved. A disposal that trips immediately after being freed usually has a winding fault, and that one is finished.
Humming means jammed. The allen key under the unit usually fixes it.
Call Now: 1-866-203-6890Where disposals leak
The leak location tells you whether this is a repair or a replacement, and it is the single most useful diagnostic on the unit.
From the sink flange at the top. The mounting seal or plumber putty has failed, or the mounting ring has loosened. Repairable: drop the unit, clean the flange, re-seal and remount. Common after a few years, particularly where the unit has been knocked about while working in the cabinet.
At the drain outlet or the dishwasher inlet. A gasket or clamp. Cheap and quick.
At the trap or tailpiece joint. Not the disposal at all. A slip joint washer or a misaligned trap, sometimes caused by a replacement unit that sits at a different height and put the trap out of alignment.
From the bottom of the unit body. This one is terminal. Water coming from the base means the internal seal above the motor has failed and water is reaching the motor. There is no serviceable repair, the unit is replaced. Anyone offering to reseal the bottom of a disposal is selling you a short-lived fix.
From a cracked body. Also terminal, and often the result of a hard freeze in an unheated space or an impact.
When the problem is the drain, not the disposal
A great many disposal call-outs are drain call-outs. The symptoms overlap, and the distinction saves buying hardware you do not need.
If the disposal spins freely and sounds normal but water backs up in the sink, the restriction is downstream. Likely places are the trap, the trap arm, the branch drain to the stack, or, on a double sink, the shared tee where disposal output meets the other bowl and drives water up into it.
Grease is the usual culprit in a kitchen line, and disposals accelerate it: finely ground food combined with fat produces a paste that coats pipe walls and gradually closes the bore. This is why a kitchen line on a house with a disposal generally needs cleaning more often than one without, and why running plenty of cold water while grinding genuinely matters, it carries the debris beyond the trap instead of leaving it there.
We diagnose by testing the other bowl and other fixtures, running the disposal dry to confirm the motor, and then clearing the line properly with a cable or, where grease has built up over years, hydro-jetting. Replacing the disposal in that situation changes nothing.
The other frequent finding on a double sink is a dishwasher drain hose with no high loop or air gap, which lets dirty water siphon back. We correct that as part of any disposal installation because it is a code requirement and it is missed constantly.
Leaking from the bottom means replacement. No reseal will hold.
Book a RepairWhen replacement is the answer
Replace when water leaks from the base or the housing is cracked; when the motor is dead or trips immediately on reset; when the shredder ring is worn away and grinding has become ineffective; or when the unit is very old, noisy and being worked around.
Repair when it is a jam, a reset, a switch, a mounting seal, a drain gasket, or a smell.
A replacement is genuinely straightforward, an hour, plus whatever the old mounting fights. What makes it a job worth doing properly is the surrounding detail: new mounting seal and flange, correct trap alignment for the new unit height, a dishwasher connection with the plug knocked out and a high loop fitted, and a check that the electrical supply and switch are sound.
Choosing a unit
Motor size. One-third horsepower is the budget tier and struggles with fibrous waste. Half is the sensible minimum for most households. Three-quarters suits a family that cooks a lot. One horsepower is worth it for heavy use and is noticeably quieter under load because it is not straining.
Continuous feed or batch feed. Continuous is the familiar wall-switch type. Batch feed only runs with a stopper cover in place, which is materially safer where there are children and prevents anything falling in while it runs.
Grind stages. Multi-stage grinding produces finer waste, which passes through a drain line more reliably. On a house with an older or shallow-fall drain, that is a real advantage.
Sound insulation. The main practical difference between price tiers in daily use. Insulated units are dramatically quieter.
Stainless components. Stainless shredder rings and impellers resist corrosion far better than galvanised, which matters on an appliance living in wet conditions permanently.
Septic systems. If the house is on septic, think carefully. A disposal materially increases solids load, which means more frequent tank pumping and more stress on the drain field. Some jurisdictions restrict them on septic. Septic-specific units exist but the honest advice for many septic households is to compost instead.
Using one without wrecking it
Cold water, always, and plenty of it, before, during and for fifteen seconds after. Cold keeps fat solid so it fragments and washes away rather than coating the pipe. Hot water melts it, and it re-solidifies in your drain line.
Feed gradually rather than filling the chamber and switching on.
Keep out: grease and oil, bones, fruit pits, coffee grounds, eggshells in quantity, pasta and rice which swell, potato peel which turns to paste, and fibrous material, celery, corn husks, artichoke, onion skins, which wraps around the impellers. And obviously nothing non-food.
Clean it with ice cubes and a little cold water, which scours the chamber, and scrub the underside of the splash guard occasionally, because that is where the smell lives. Citrus peel in small amounts freshens it. Chemical drain cleaner does not belong in a disposal; it sits against metal and seals and does more harm than the blockage.
Sink backing up with the motor fine? That is a drain job.
Get a Drain QuoteServices that often go with this one
- Drain cleaning
- Hydro jetting
- Faucet & fixture installation
- Septic system plumbing
- Emergency plumbing
- Leak detection
Where we cover
Available in all seven regions, 155 Oregon communities.
Garbage disposals, answered
No, it is jammed. Turn it off at the switch and the breaker, fit the allen key into the hex socket underneath and work the plate free, retrieve the object with pliers, press the red reset button and try again with cold water running. If it will not free or trips again immediately, then it needs looking at.
The red reset button on the underside of the unit, then the breaker, then the switch and any outlet under the sink. Thermal overload trips are extremely common after a jam and the reset is all that is needed.
Depends entirely on where. Leaks at the sink flange, the drain outlet or the dishwasher inlet are gasket and seal work and are cheap. A leak from the bottom of the body means the motor seal has failed and the unit has to be replaced, there is no reliable repair for that one.
If the motor spins freely, the restriction is downstream in the trap or the branch drain, usually grease combined with finely ground food. Clearing the line is the fix; a new disposal would change nothing.
Physically yes, sensibly often no. It increases solids substantially, which means more frequent pumping and more load on the drain field, and some jurisdictions restrict it. If you are on septic, ask us before fitting one, composting is frequently the better answer.
Cold, and plenty of it. Cold keeps fats solid so they break up and flush through. Hot water liquefies grease which then re-solidifies further down the line, which is exactly how kitchen drains block.
On septic? Ask us before fitting one at all.
Talk to a PlumberDiagnosed before it is replaced
Jams, resets, seals and switches are repairs. A leaking base or a dead motor is a replacement. We will tell you which, and fit the new unit with correct drain alignment and a proper dishwasher connection.
Statewide · same-day where dispatch allows
Call 1-866-203-6890