Standing water at the bottom of your dishwasher is frustrating, and it can leave dishes dirty and create an unpleasant smell. The good news is that many drainage problems have straightforward causes. This guide covers the most common reasons a dishwasher will not drain, what you can check safely, and when to call for dishwasher repair.
Check the Filter and the Bottom of the Tub
Start with the filter. Most dishwashers have a removable filter at the bottom of the tub that catches food particles. If it is clogged, water cannot drain properly. Remove the lower rack, take out the filter if your model allows it, rinse it under warm water, and clear away any food or debris. Also check the bottom of the tub for small items, glass, or food that may be blocking the drain area.
Look at the Drain Hose and Garbage Disposal
The drain hose carries water from the dishwasher to the sink drain or garbage disposal. If the hose is kinked, pinched, or clogged, water can back up. If you can safely access the hose under the sink, check that it is not bent sharply. Also check the disposal: if you recently installed a new garbage disposal, the drain plug that connects to the dishwasher may still be in place, which blocks drainage. That plug should be removed by the installer.
Another simple check is to run the garbage disposal briefly before starting the dishwasher. If the disposal is full of food waste, it can slow drainage. Only do this if the disposal is working normally and there is no standing water or electrical concern.
Other Common Causes
If the filter and hose look clear, the problem may be inside the dishwasher. A faulty drain pump can fail to push water out, often with a humming or buzzing sound. A clogged drain valve, a stuck check valve, or a control problem can also stop draining. If the dishwasher fills but never drains, or if it stops mid-cycle with water inside, these parts may need testing.
Do not tip the dishwasher or remove panels to reach the pump or wiring unless you are trained. Dishwashers combine water and electricity, so internal repairs are best left to a technician. Turn off the dishwasher and avoid running more cycles if water is backing up or leaking.
What to Try Before You Call
Try these safe steps: clean the filter, check for debris in the tub, make sure the drain hose is not kinked, and run the disposal if needed. You can also try a drain or cancel cycle, if your model has one. If the water clears, run a short cycle with no dishes to confirm it drains fully. If water remains, note whether the dishwasher makes noise, whether it fills normally, and whether the problem started after a new installation or repair.
Dishwasher Repair Options
If the simple checks do not fix the drainage, SmartRepair201 can help with dishwasher repair. There is an $80 trip charge, which is applied towards the repair if you choose to proceed. Call 201-820-4368 to schedule service and get clear options for your dishwasher.
Frequently Asked Questions
Can I use a plunger on my dishwasher? It is best not to plunge a dishwasher. Plunging can push water into areas it should not go and may damage seals or connections. Stick to cleaning the filter and checking the hose, then call for service if water remains.
Why does my dishwasher leave water after the cycle? A small amount of water in the filter area can be normal on some models, but a pool of water covering the bottom usually means a clog, kinked hose, or pump problem. Clean the filter first, then schedule service if it does not clear.
Should I keep running the dishwasher if it is not draining? Avoid running more cycles if water is backing up or leaking. Turn the dishwasher off, keep the area dry, and schedule service. Call 201-820-4368 for help.