Dishwasher Won't Drain?
Clear the Clog and Restore Performance
Understanding This Problem
A dishwasher that doesn't drain properly leaves standing water in the tub, creates odors, and prevents proper cleaning. While some drainage issues have simple solutions, others require professional diagnosis. Understanding the drainage system helps identify the problem.
Common Causes (Most to Least Likely)
Clogged Drain Filter
Food particles and debris accumulate in the drain filter at the bottom of the dishwasher. This is the most common cause of drainage problems and is easily cleaned.
Garbage Disposal Knockout Plug
If your dishwasher drains through the garbage disposal and was recently installed, the knockout plug may not have been removed.
Kinked or Clogged Drain Hose
The drain hose connecting the dishwasher to the disposal or drain can become kinked, pinched, or clogged with debris.
Air Gap Blockage
If your dishwasher has an air gap (the cylindrical device on the countertop), debris can clog it and prevent proper drainage.
Faulty Drain Pump
The drain pump moves water out of the dishwasher. If it fails, water will remain in the tub. You may hear the motor running without draining.
Drain Valve Issues
Some dishwashers have a drain valve that opens to release water. If stuck closed, the water can't exit.
Warning Signs to Watch For
- Standing water after every cycle
- Dishes not getting clean due to dirty water
- Foul odors from the dishwasher
- Water backing up into the sink
- Unusual sounds during the drain cycle
Things to Try First
Before calling for service, try these troubleshooting steps:
- 1Manually remove standing water with cups or towels
- 2Clean the drain filter—remove and rinse under running water
- 3Run the garbage disposal to clear shared drain
- 4Check and clean the air gap if equipped
- 5Inspect drain hose for kinks
When to Call a Professional
- Cleaning the filter doesn't resolve the issue
- You hear the drain pump running but water doesn't drain
- The drain hose appears clear but water won't drain
- You're not comfortable checking the drain pump
- Error codes appear related to drainage
Prevention Tips
- Scrape dishes before loading—don't pre-rinse excessively
- Clean the drain filter weekly or bi-weekly
- Run the garbage disposal before starting the dishwasher
- Use the right amount of detergent to prevent buildup
- Run hot water at the sink before starting a cycle
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Pro Tip
Arizona's extreme heat puts extra stress on appliances, especially refrigeration units. Regular maintenance and prompt attention to symptoms can prevent costly breakdowns and extend appliance life.
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