A dishwasher that won’t drain is a frustrating problem, but it’s also one of the most common issues homeowners face. If you open your dishwasher to find standing water at the bottom, don’t panic. There are several potential causes—and most can be fixed without calling a repair technician.
1. Check for a Clogged Filter
The dishwasher filter traps food particles and debris to prevent them from entering the drain pump. Over time, this filter can become clogged, restricting water flow. To clean it:
- Remove the bottom rack.
- Locate the filter (usually at the bottom center).
- Twist and lift it out, then rinse it thoroughly under warm water.
2. Inspect the Drain Hose
The drain hose connects the dishwasher to the sink drain or garbage disposal. If this hose is kinked, clogged, or blocked, water won’t drain properly. Try the following:
- Disconnect the hose and check for obstructions.
- Use a long, flexible brush to clear any blockages.
- Ensure the hose is not bent or pinched behind the unit.
3. Check the Garbage Disposal (If Applicable)
If your dishwasher drains into the garbage disposal, a clog there could be the culprit. Also, make sure the knockout plug was removed when the dishwasher was installed. If not, water won’t be able to drain at all.
4. Examine the Air Gap
Some dishwashers have an air gap (a small cylinder near the sink faucet) that prevents dirty water from backflowing. If it’s blocked, water won’t drain. Remove the top cover and clean out any debris inside.
5. Test the Drain Pump
If you’ve ruled out clogs and blockages, the drain pump might be malfunctioning. This component actively pushes water out during the drain cycle. If it’s damaged or worn out, it may need to be replaced. Unusual noises or humming during the drain cycle are warning signs.
6. Run a Cleaning Cycle
Sometimes, mineral buildup or grease can accumulate inside the machine. Running a cleaning cycle with a dishwasher cleaner or vinegar and baking soda can help flush out minor clogs.
7. Call a Professional
If none of the above steps solve the problem, it may be time to consult a qualified technician. More complex issues like faulty control boards or wiring problems may require professional attention.
Final Thoughts
A dishwasher that doesn’t drain can usually be fixed with a bit of troubleshooting. Regular maintenance—like cleaning the filter and inspecting the hose—can prevent drainage issues before they start. By addressing the problem early, you can save time, money, and the headache of hand-washing dishes.