Short answer:
A dishwasher usually won’t drain because of a clogged filter, blocked drain hose, or a problem with the drain pump.
Most Common Reasons a Dishwasher Won’t Drain
1. Clogged Dishwasher Filter
Food debris, grease, and soap buildup can block the filter at the bottom of the dishwasher.
What to do:
- Remove the bottom rack
- Twist out the filter
- Rinse under hot water
- Use a soft brush if needed
2. Blocked Drain Hose
The drain hose can kink or clog with food or grease.
What to check:
- Look under the sink
- Make sure the hose isn’t bent
- Disconnect and flush it if necessary
3. Garbage Disposal Blockage
If your dishwasher drains into a disposal, a clog there will stop drainage.
Fix:
- Run the disposal
- Make sure the knockout plug was removed if it’s newly installed
4. Drain Pump Failure
If the pump hums or is silent, it may be bad.
Signs of a bad pump:
- Standing water after every cycle
- Loud humming noises
- No water movement during drain cycle
Can I Use My Dishwasher If It Won’t Drain?
No. Standing water can damage the motor and cause leaks or mold.
When to Call a Professional
Call a technician if:
- The pump is faulty
- Water remains after cleaning filters and hoses
- You see error codes related to draining