How to Troubleshoot a Dishwasher That Won’t Drain

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As a technician with years of experience in appliance repair, I often receive calls from homeowners facing the frustrating issue of a dishwasher that won’t drain. This problem can lead to standing water at the bottom of the appliance, which not only affects cleaning performance but can also lead to unpleasant odors. In this article, I will guide you through a series of safe checks and steps to help you diagnose and potentially fix your dishwasher.

Step 1: Check the Filter

The first step in troubleshooting a dishwasher that won’t drain is to check the filter. A clogged filter can prevent water from draining properly. Here’s how to do it:

  1. **Turn Off the Dishwasher**: Safety first! Ensure the dishwasher is turned off and unplugged.
  2. **Locate the Filter**: Open the dishwasher door and remove the bottom rack. The filter is usually located at the bottom of the tub.
  3. **Remove and Clean the Filter**: Twist or pull the filter out, depending on your model. Rinse it under warm water to remove any debris or food particles.
  4. **Reinstall the Filter**: Once clean, reinstall the filter securely back into place.

Step 2: Inspect the Drain Hose

If the filter is clean but the dishwasher still won’t drain, the next step is to inspect the drain hose:

  1. **Check for Kinks**: Examine the drain hose for any kinks or bends that could restrict water flow.
  2. **Ensure Proper Connection**: Make sure the hose is securely connected to both the dishwasher and the sink drain or garbage disposal.
  3. **Look for Blockages**: Disconnect the hose and check for any blockages. You can use a long brush or a flexible cleaning tool to clear any debris.

Step 3: Examine the Garbage Disposal

If your dishwasher is connected to a garbage disposal, it’s essential to check it as well:

  1. **Run the Disposal**: Turn on the garbage disposal to ensure it’s functioning properly. Sometimes, running it can help clear any clogs.
  2. **Check the Knockout Plug**: If the dishwasher was recently installed, ensure that the knockout plug in the disposal was removed. This plug can block drainage.

Step 4: Test the Drain Pump

If the previous steps didn’t resolve the issue, the drain pump may be malfunctioning:

  1. **Listen for Sounds**: When the dishwasher is in a drain cycle, listen for the sound of the drain pump. If you don’t hear anything, it may need to be replaced.
  2. **Check for Obstructions**: Inspect the drain pump for any visible obstructions or debris that could be preventing it from functioning.

Conclusion

In conclusion, troubleshooting a dishwasher that won’t drain involves a series of systematic checks. By following these steps, you can identify common issues such as a clogged filter, blocked drain hose, or malfunctioning pump. If you’ve tried these solutions and your dishwasher is still not draining, it may be time to consult a professional technician for further assistance. Remember, regular maintenance can help prevent these issues in the future, ensuring your dishwasher operates efficiently.