Reach into the disposal (or use pliers) to retrieve the plastic disc. If you leave it, it can damage the disposer blades. 2. Run the Disposal to Clear Blockages
If you find standing water at the bottom of your dishwasher, check these common culprits, ranked by likelihood:
A heavily soiled or clogged filter basket inside the dishwasher will stop water from reaching the drain pump. 5-Step Guide to Fixing a Dishwasher Not Draining dishwasher not draining garbage disposal
A few simple, regular maintenance steps can prevent this annoying problem from returning.
The hose running from the dishwasher to the sink can become clogged with grease, food, or develop a kink, preventing drainage. Reach into the disposal (or use pliers) to
Disconnect the dishwasher drain hose from the garbage disposal.
Fortunately, diagnosing this issue requires no tools and follows a simple logic. Before calling a repair technician or disassembling the dishwasher, run the garbage disposal with a strong flow of cold water. Often, the sound of the disposal grinding up a dislodged chunk of debris is followed by the satisfying gurgle of standing water suddenly draining from the dishwasher. If that fails, check the air gap (the small chrome cylinder on the sink) for clogs, or inspect the dishwasher filter. But in the vast majority of cases, the solution is as straightforward as remembering that your dishwasher and disposal share a single, crucial pipeline. Keeping the disposal clean, running it regularly, and always removing the knock-out plug during installation will ensure that this partnership remains functional—and your dishwater ends up where it belongs. Run the Disposal to Clear Blockages If you
Remove the shiny metal cover from the cylinder on your sink. Unscrew the plastic cap underneath. Use a small brush or pliers to remove any built-up gunk. 4. Clear the Drain Hose If the hose is kinked, it won't drain. Inspect the rubber hose under the sink for bends or twists.
This guide covers why this happens and provides step-by-step solutions, including the #1 reason for new installations: a forgotten knockout plug. The Top 5 Causes of Dishwasher Drain Issues
Even with the plug removed, the disposal remains a primary suspect. A sink full of water that drains slowly, combined with a non-draining dishwasher, almost always points to a clog in the main drain downstream of the disposal. Food grease, coffee grounds, and fibrous vegetable peels can accumulate in the disposal’s internal chamber or the pipe beyond it. When this happens, water from the disposal side backs up into the dishwasher’s drain hose, creating a two-way problem. Furthermore, a disposal that hasn’t been run recently may harbor hardened food debris that physically blocks the dishwasher’s inlet port.
