4 Tips for a Thermador Dishwasher Not Draining Water

Dishwasher draining problems can result from blockages at several locations, even among high-end brands. Why is my Thermador dishwasher not draining water? A clogged drain hose prevents water from draining to the sink or disposal. Try these Thermador dishwasher troubleshooting tips to remove blockages and restore function.

Thermador Dishwasher Not Draining? Here’s How to Solve the Problem.

Before determining the source of draining problems, you likely have a puddle of water that needs to disappear. Wondering how to remove standing water in my dishwasher? Scoop up as much as possible with a cup or plastic container before absorbing the remainder with towels or sponges. Once the water is removed, here’s how to pinpoint the reason for a Thermador dishwasher not draining properly.

#1. Dishwasher Filter Needs Cleaning

A dirty filter is one of the most common reasons a Thermador dishwasher won’t drain. This filter screens out food particles to prevent them from clogging the dishwasher drain pump. However, without regular cleanings, the filter can become clogged with this debris, preventing water from draining. If you also notice that your dishwasher leaves dishes dirty or has a bad odor, the filter likely needs cleaning. 

Follow these steps to clean a Thermador dishwasher filter:

  • Remove the bottom rack to access the filter at the base of the dishwasher.
  • Unscrew the filter by turning it counterclockwise.
  • Disassemble the cylindrical filter from the mesh screen and rinse both under running water.
  • Use a soft bristle brush to scrub away lingering debris.
  • Reassemble the filter and screen.
  • Replace the filter in its housing and twist clockwise to lock it in place.
  • Replace the dishwasher’s bottom rack. 

Thermador’s dishwasher cleaning tips recommend cleaning the filter every 2-3 months to prevent clogs and blockages.

thermador dishwasher not draining

#2. Dishwasher Drain Hose Clogged

Clogs in the drain hose can also result in a Thermador dishwasher drain problem. These clogs block the flow of water, causing it to back up into the dishwasher tub. Often, these blockages consist of an accumulation of debris or a particularly large food particle. Most can be found near the hose’s connection at the sink or disposal or the dishwasher drain pump. 

Inspecting the hose for clogs involves disconnecting it from the drain pump and sink or disposal drain. This more complex job is best performed by a professional repair service or an experienced DIYer.

Use these guidelines to remove drain hose blockages:

  • Refer to your user manual to determine how to disconnect the hose from the drain pump. The dishwasher may have to be moved to access the pump and unclamp the hose.
  • Inspect the hose for any visible blockages and gently remove them with a screwdriver or straightened wire hanger.
  • If no clogs are visible, disconnect the hose from the disposal or sink drain to assess blockages.
  • If the clog can’t be reached, the drain hose must be replaced.

#3. Air Gap or Garbage Disposal Problem

If you have a garbage disposal or air gap, they usually share a common drain with the dishwasher. Given this setup, clogs in either component can be why your Thermador dishwasher does not drain. To reduce garbage disposal blockages, we recommend running the disposal before starting a dishwasher cycle. This will dispose of any lingering food particles in the drain, ensuring that water can flow unobstructed.

For those kitchens with an air gap, regular cleanings can prevent drain blockages. Remove the air gap cover, and scoop away any visible debris with a paper towel. We suggest cleaning the air gap on a monthly basis to prevent blockages.

#4. Defective Thermador Dishwasher Drain Pump

If you’ve assessed for clogs and still find your Thermador dishwasher not draining water, the drain pump may be defective. The pump uses impellers to expel water out of the dishwasher and into the drain hose. It’s possible that the impellers have malfunctioned or the drain pump motor has failed, leaving the dishwasher unable to drain properly.

If the pump motor lacks continuity with multimeter testing or the impellers aren’t working, the drain pump should be professionally replaced.

Need some help when you find your Thermador dishwasher not draining? The technicians at Ortega’s Appliance Service can handle any dishwasher repair. Call or schedule online for prompt and reliable service!

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