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What Does the E22 Error Code Mean on a Thermador Dishwasher?
Every single time an error code appears on your dishwasher, it is almost like some kind of encrypted message standing between you and a perfectly clean load of dishes. If you receive an error code E22 on your Thermador dishwasher, there is no need to panic.
This means that your dishwasher is trying to tell you something.
Now, let’s break down what the E22 error really means, why it happens, and-most importantly-how you can address it effectively. A little insight into what’s going on should help you to get your dishwasher up and running again.

What does this E22 Error Code indicate?
E22 is a particular error code with your Thermador dishwasher, where the main cause is draining issues, comprising a blockage in the filter or incomplete drainage. This basically means that generally, water will not flow as it should outside the dishwasher to leave pools at the bottom of the tub. Most often, this is usually due to buildups or other debris in either the filter or drain system.
While this may be a little inconvenient, fortunately it’s a relatively common problem and it’s usually something that you can troubleshoot and fix by yourself.
Why Does the E22 Fault Appear?
There could be a number of reasons why you get the code E22. Following are some of the most common causes:
Blockages in Filter
Over time, food particles, grease, and other particles may accumulate in the filter inside the dishwasher. When clogged, it restricts easy water circulation when draining.
Clogged Drain Hose
The drain hose enables water to exit your dishwasher. When kinked, clogged, or badly installed, the hose can impede the flow of water, hence triggering this error code.

Dirty Sump Area
The sump is the area of the machine where water collects before being pumped out. Sometimes, debris can build up in this area and affect drainage.
Faulty Drain Pump
In other instances, the code E22 would mean the pump that’s supposed to remove the water has gone bad. This is more infrequent but mostly requires expert assistance.
Hard Water Buildup
Well, if you are living in an area where hard water is being supplied, these minerals, over time, accumulate in the components and block the path of proper drainage.
How to Fix the E22 Error Code
Now that you can have an idea of what might be causing this issue, here’s a step-by-step guide to troubleshoot and resolve it:
1. Clean the Dishwasher Filter
- Start by removing the bottom rack of your dishwasher to reach the filter.
- To unlock, twist the cylindrical or flat filter counterclockwise and gently pull it out.
- Rinse the filter under warm running water to get rid of the food particles and debris. Use a soft brush and dish soap for more difficult grime.
- Reinstall the filter and ensure it is securely locked into place.

2. Check & Clean the Drain Hose
- Safety first: start by disconnecting the power supply to your dishwasher.
- Check behind the unit for the drain hose; this could be kinked, clogged, or ill-positioned.
- Clear off any blockages you come across using a straightened wire coat hanger or drain snake. If necessary, the inside of the hose may need flushing with hot water to dissolve grease or other buildups.
3. Sump Area Inspection and Cleaning
- Glance into the bottom of your dishwasher where the water sits.
- If it appears that something could be there, take this sump area off carefully, being careful of the potential internal component.
4. Pump on the Drain Check
If the above steps do not solve the error, the problem is probably with the drain pump. Check if there is any visible blockage around the inlet of the pump. In case the motor of the pump is at fault, contact a professional technician to diagnose the fault and get it repaired.
5. Descale and Clean the Dishwasher
- If building-up of hard water is persistent, consider using a dishwasher-compatible descaling product to clean internal parts.
- Create a cleaning cycle with distilled vinegar that works at dissolving mineral deposits.

When to Call a Professional
If you have followed the above steps to troubleshoot it and the E22 error code still persists, then it’s about time the situation calls for a professional. Persistent issues may be indicative of a more serious problem with the drain pump or another component of the dishwasher’s drainage system. A qualified technician can diagnose the issue accurately and recommend the solution.
Preventing Future E22 Errors
Once your dishwasher is working again, consider incorporating the following easy habits to avoid any future occurrences of the E22 code:
- Regular Filter Cleaning: Get into the habit of cleaning the filter every 1-2 weeks, particularly if you use the dishwasher a great deal.
- Scrape Off Dishes: Scrape large food particles off your dishes before putting them in the dishwasher.
- Maintenance Cycle: Run a cleaner for dishwashers monthly to eliminate grease, debris, and mineral deposits.
- Periodical Check of the Drain Hose: Check that there is no clog in the drain hose, and it should be correctly positioned.
Conclusion
An error code like E22 can be frustrating, but understanding its cause and implementing these fixes can get your Thermador dishwasher operating efficiently again. With regular maintenance and a bit of care, you’ll reduce the risk of future errors and keep your dishes gleaming clean.
If you’ve had experience with the E22 error code or have additional tips for maintaining your dishwasher, we’d love to hear from you! Share your thoughts in the comments section, or reach out to your Thermador support team for more tailored assistance.