How to Unclog a Double Kitchen Sink with a Garbage Disposal

The most critical first step is to ensure your safety by completely cutting power to the garbage disposal. Go to your home's main electrical panel and switch off the circuit breaker that controls the garbage disposal. If you're unsure which breaker it is, turn off the main breaker for the kitchen. Alternatively, if the disposal is plugged into an accessible outlet under the sink, simply unplug the power cord. Double-check that the power is off by flipping the disposal's switch on the wall; it should do nothing.

With the power safely off, use a flashlight to look down into the garbage disposal's drain opening. Check for any visible obstructions like silverware, bones, fruit pits, or other hard objects that may have jammed the blades. If you see an obstruction, use a pair of tongs or pliers to carefully retrieve it. Never, under any circumstances, use your hand to reach into the disposal chamber.

Even after removing visible obstructions, the blades (impellers) might still be stuck. Locate the small hexagonal hole on the very bottom of the disposal unit. Insert the Allen wrench that came with your disposal (often called a jam-buster wrench) into this hole. If you don't have it, a standard 1/4-inch Allen wrench will usually fit. Turn the wrench back and forth with firm pressure. This will manually rotate the blades, freeing them from whatever was causing the jam. You should feel the blades move freely in both directions when the jam is cleared.

After freeing the blades, locate the small, typically red or black, reset button on the bottom of the disposal unit, near where you used the Allen wrench. This button is a mini-circuit breaker that may have tripped when the motor was overloaded. Press the button firmly until it clicks and stays in. Now, you can restore power at the circuit breaker or by plugging the unit back in. Turn on the cold water and then briefly flip the disposal switch. If it runs freely, the jam is cleared. Let the water run for a minute to flush any remaining debris. If the water still doesn't drain, the clog is further down the pipe.

If the disposal runs but water still won't drain, the clog is in the drainpipe. First, stop up the non-disposal side of the sink using a sink stopper or a wet rag, ensuring a tight seal. Fill the disposal side of the sink with 3-4 inches of water. Place a cup-style plunger over the disposal drain opening, ensuring a good seal. Vigorously pump the plunger up and down for 30-60 seconds. The pressure created should force the clog through the P-trap and down the main drain. If the water drains away, you've succeeded. If not, proceed to the next step.

If plunging fails, the clog is likely lodged in the P-trap, the U-shaped section of pipe under the sink. Place a large bucket directly underneath the P-trap to catch water and sludge. Have several old towels ready. Using a pair of channel-lock pliers, carefully loosen the two large slip nuts that connect the P-trap to the sink's tailpiece and the wall pipe. Water will start to drain out. Once the nuts are loose enough, you can unscrew them by hand. Remove the P-trap section and empty its contents into the bucket. Clean the inside of the trap thoroughly with a brush or a rag. Also, check the horizontal pipe going into the wall for any obstructions.

After the P-trap is clean, re-install it by reversing the removal process. Ensure the plastic washers (slip-joint washers) are correctly seated inside the slip nuts. Hand-tighten the nuts first to ensure they are not cross-threaded, then give them a final quarter-turn with the channel-lock pliers. Do not over-tighten, as this can crack the plastic fittings. Once reassembled, run hot water into the sink for several minutes and carefully check both slip nuts for any drips or leaks. If you see a leak, try tightening the nut slightly more. If the sink now drains freely and there are no leaks, the clog has been successfully cleared.