Two different problems get called a clogged disposal. One is a jam: the motor hums but the blades will not spin. The other is a drain clog: the blades turn fine, yet water lingers in the basin or surfaces in the second side of a double sink. A hex key from beneath the unit frees a jam. Drain clogs get cleared at the trap or the line, and a stubborn one needs a plumber who handles drain cleaning and hydro jetting.
How do I tell a jammed disposal from a clogged drain?
A hum with no movement when you hit the switch means the grinder is jammed. A disposal that runs normally while the basin fills or drains slowly signals a clog farther down the drain. Total silence sends you to the red reset button and the outlet or breaker.
One quick test sorts it out. With the disposal off, run cold water. Fast draining plus a unit that will not grind is a mechanical jam. A basin that fills and empties slowly with the disposal off means the blockage is in the trap, or in the branch line beneath it.
A double sink offers a clue. If only one basin has the disposal and water climbs in the other while the disposal runs, the shared drain is blocked beyond the disposal.
How do I clear a jammed garbage disposal safely?
Kill the power at the switch on the wall and at the breaker, then light the inside with a flashlight and lift out anything visible using tongs, never fingers. Seat a quarter-inch hex key into the hex socket at the bottom of the unit and rock it to and fro until it spins freely. Finish by pressing the red reset button.
The steps below follow guidance published by manufacturer Moen:
- Flip the wall switch off. For added safety, unplug the unit or trip the breaker.
- Shine a flashlight inside. Pull out bottle caps, utensils or bones using pliers or tongs.
- Locate the hex socket at the bottom center. Fit the key in and rock it until the grinder moves without resistance, then remove the key.
- Push in the red reset button at the base of the unit.
- Bring the power back, run cold water, and turn the disposal on.
If the reset button pops back out right away, the motor is overloaded or failing. A disposal that trips the breaker, leaks from the bottom or keeps humming after a clear jam is usually due for replacement. Never put your hand into the unit, even with the power off.
How do I unclog the drain below a disposal?
Slide a bucket under the trap, loosen both slip nuts with your fingers, take the trap down and tip it out. Clean the pipe arm running to the wall with a bottle brush or small hand auger. Put everything back, run hot water and look for leaks. Packed grease and coffee grounds in that trap explain most slow disposal drains.
Plunge before unscrewing anything. Put a few inches of water in one basin, jam a damp rag into the other opening or the disposal throat, and pump firmly and evenly. A plunger sealed over the open drain can shift a soft clog.
Keep an eye on the dishwasher as well. Its hose normally joins the disposal, so a blockage there can send dirty water up into the dishwasher. That side of the system is explained on our page about a clogged dishwasher drain.
What should never go down a garbage disposal?
Grease, large amounts of coffee grounds, pasta, rice, potato peels, celery, bulk eggshells and fibrous scraps are what pack into the trap, though the grinder can chew them. Cooking oil cools and coats the pipe wall. Never run the disposal with hot grease in it, and keep bones and fruit pits out.
A few habits keep the drain open. Run cold water for 15 seconds before, during and after a load, feed scraps gradually, and after greasy dishes rinse the line using hot water and dish soap. Old Valley homes with cast iron kitchen drains narrow with rust and buildup over decades, so a disposal that clogs again and again is often a sign the pipe past the trap is restricted.
Should I use a chemical drain cleaner in a disposal?
No. Caustic cleaners linger in the sink bowl, burn skin and eyes, and wear out the disposal's seals. After exposure, Poison Help answers at 1-800-222-1222, and 911 applies if breathing is hard. When a chemical has been used already, say so to the plumber before the trap is opened so protection gets worn.
For something gentler, stick to the plunger, a trap clean-out, or hot soapy water. Our page on a natural remedy for a clogged drain explains what helps and what does not.
When should I call a plumber for a disposal clog?
Phone one when the hex key and reset leave the grinder stuck, when the unit leaks, when the sink stays slow after a clean trap, or when other kitchen or bath fixtures back up. A clog beyond the kitchen branch calls for a cable or jetter, not another bottle of cleaner.
Replacing a disposal is also plumber territory when the unit is old or the mounting ring has corroded. Expect the visit price in writing ahead of the job. Describe it through the quote page and we send a local plumber to your kitchen.
Kitchen sinks as a whole are covered in unclogging a kitchen sink.
Questions people ask
How much time does clearing a disposal take?
The hex key and reset need about five minutes, and trap cleaning runs 15 to 30. For a plumber running a cable through the line, expect under an hour, plus time for old pipe or a camera inspection. Swapping out a disposal is a longer visit, and may stretch to a couple of hours.
What do I ask a plumber before booking a disposal job?
Check whether the price includes clearing the line past the trap, whether a new unit is a separate quote, how the price is built, and whether the plumber will explain the cause of the clog. Have it written down ahead of the work, and mention what has gone down the drain.
Does someone have to be at home during the visit?
Yes, though a trusted adult can stand in. Someone must open the sink cabinet, let the plumber test the unit with water running, and approve the price before anything is replaced or opened. Empty the cabinet first and report whether the unit hums, trips the breaker or leaks.
Why does my disposal hum without turning?
A hum without rotation is nearly always a jam, with a hard object or buildup holding the grinder. Kill the power, grab visible objects with tongs and turn the grinder using the hex key from below. If humming continues once the jam is gone, the motor or capacitor may be on its way out.
Can I put ice or lemon peels down the disposal to clean it?
People often suggest ice and citrus peels for freshening, yet neither clears a clog. A small amount is harmless in a working unit, but a blocked drain stays blocked. When the sink backs up, go through the trap and the line instead.
This guide is one of many on plumber across Burbank.
References
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