Before reassembling everything, check the single most common external cause of a dishwasher backup: a full garbage disposal. Dishwashers often drain into the disposal’s side inlet. If your disposal is clogged with food scraps, the dishwasher’s water has nowhere to go. Run the disposal with cold water for 30 seconds. If it hums but doesn’t spin, it may be jammed—use the hex wrench that came with it (or an Allen key) to manually turn the motor from the bottom.
To inspect it, you will need to remove the filter again. Shine a flashlight down into the opening. You are looking for the small, finned impeller. Sometimes, you can see a piece of debris lodged in its blades. Use a pair of long needle-nose pliers or a bent wire coat hanger to gently extract the blockage. Important safety note: disconnect the dishwasher from power (unplug it or flip the circuit breaker) before putting any metal tool inside the pump. dishwasher clogged drain
Now you have a long, slimy tube. Run a garden hose through it, or use a plumbing snake (a flexible auger) to push the clog out. Often, the clog is a “greaseberg” that has accumulated over months. You can also simply replace the hose entirely—they are inexpensive and far easier than deep cleaning. Before reassembling everything, check the single most common