Garbage Disposal Not Working? 6 Fixes Before Calling a Plumber
Before paying $150 to $300 for a plumber, try these 6 fixes that solve 90% of garbage disposal problems. Most take under 5 minutes with tools you already have.
Safety First: Never Put Your Hand in the Disposal
Before you do anything, understand the number one rule of garbage disposal repair: never put your hand inside the disposal, even when it is turned off. The impeller blades are sharp and the disposal can be accidentally activated. Always use tools, not fingers, to clear jams. If you need to reach inside for any reason, unplug the disposal from the outlet under the sink or turn off the circuit breaker that powers it. This is not optional. Emergency rooms see thousands of garbage disposal injuries every year, and they are entirely preventable.
Fix 1: Hit the Reset Button
The most common reason a garbage disposal stops working entirely is a tripped internal breaker. Every garbage disposal has a small red or black reset button on the bottom of the unit. Reach under the sink, feel the bottom of the disposal, and press this button. You should feel it click. Then try turning the disposal on. This fix solves about 30 percent of all garbage disposal issues. The internal breaker trips when the disposal is overloaded, overheated, or jammed. If the reset button pops out again immediately, the disposal is still jammed and you need to clear the jam first using the methods below before resetting.
Fix 2: Check the Power
If pressing the reset button does not work and the disposal makes absolutely no sound when you flip the switch, it may not be getting power. Check if the disposal is plugged in by looking under the sink. The outlet is usually on the back wall of the cabinet. Try plugging something else into that outlet to verify it works. If the outlet is dead, check your circuit breaker panel for a tripped breaker. Garbage disposals are sometimes on the same circuit as the dishwasher. Also check if the wall switch that controls the disposal is functioning. You can test this by replacing the switch or bypassing it temporarily. A dead switch costs $3 to replace and takes 5 minutes if you turn off the breaker first.
Fix 3: Unjam the Disposal with an Allen Wrench
If the disposal hums but the blades do not spin, it is jammed. This is the most common problem and the easiest to fix. Look at the bottom center of the disposal and you will see a hex socket hole. Insert a quarter-inch Allen wrench (most disposals come with one in a small pouch attached to the unit) and turn it back and forth. This manually rotates the impeller plate and dislodges whatever is stuck. Common jam culprits include small bones, fruit pits, glass fragments, and pieces of silverware that fell in. Once the impeller moves freely, remove the obstruction from above using tongs or pliers, never your hand. Hit the reset button, run cold water, and turn the disposal on.
Fix 4: Clear a Clog in the Drain Line
If the disposal runs but water backs up or drains very slowly, the clog is in the drain line below the disposal, not in the disposal itself. Turn off the disposal and disconnect the drain trap, which is the curved pipe under the sink. Place a bucket underneath to catch water. Check the trap for blockages and clear them. If the clog is further down the line, use a drain snake or plumber auger inserted into the pipe after removing the trap. Most drain clogs within the first few feet of pipe can be cleared this way. Reassemble the trap, run water, and test. If the clog is deep in the wall or main line, that is when you need a professional plumber.
Fix 5: Fix a Leaking Disposal
Garbage disposal leaks come from three places. A leak from the top where the disposal meets the sink flange means the mounting bolts need tightening or the plumbers putty seal needs replacing. A leak from the side where the dishwasher hose connects means the hose clamp is loose. Tighten it with a screwdriver. A leak from the bottom of the disposal itself usually means the internal seals have failed, and this typically means the disposal needs replacement. Replacements cost $80 to $200 for the unit and about $150 to install professionally, or you can DIY the installation in about 45 minutes.
Fix 6: Eliminate Odors
A smelly garbage disposal is caused by food residue stuck to the walls, impeller, and splash guard. The most effective cleaning method is to pour half a cup of baking soda into the disposal followed by one cup of white vinegar. Let it fizz for 10 minutes, then flush with hot water while running the disposal. For stuck-on grime, toss in a handful of ice cubes and a tablespoon of coarse salt, then run the disposal with cold water. The ice and salt scour the interior walls clean. For ongoing freshness, run the disposal with cold water for 15 seconds after every use and periodically grind citrus peels like lemon or orange. Never pour grease or oil down the disposal as these coat the interior and cause persistent odors and clogs.
Pro Tips
Frequently Asked Questions
Why is my garbage disposal humming but not spinning?
A humming disposal means the motor is getting power but the impeller plate is jammed. Insert a quarter-inch Allen wrench into the hex hole on the bottom of the disposal and turn it back and forth to free the jam. Then press the reset button, run cold water, and test.
Can I use Drano in a garbage disposal?
It is not recommended. Chemical drain cleaners can damage the disposal components and are less effective than mechanical clearing methods. If the disposal drain is clogged, disconnect the trap and clear it manually, or use a drain snake. For odors, use baking soda and vinegar instead.
How much does it cost to replace a garbage disposal?
A new garbage disposal unit costs $80 to $250 depending on the horsepower and brand. Professional installation adds $100 to $200 in labor. The total replacement cost is typically $180 to $450. A one-third or one-half horsepower unit is sufficient for most households.
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