The Thermador E22 error indicates the dishwasher filter is blocked by food debris or grease. To fix this, remove the triple filter assembly from the bottom of the tub, rinse it under hot water, and scrub away any residue.
Look, I've fixed E22 on probably a hundred Thermador dishwashers and 95% of the time it's just a dirty filter. Ten minutes, no parts needed. But here's what happens if you keep ignoring it: the wash pump strains against that restriction, overheats, and eventually dies. A new circulation pump on a Thermador runs $150-300 in parts alone. Clean the filter now. Seriously.
ThermadorDishwasherSeverity: low95% DIY Success
Time to Fix
5–15 min
Difficulty
beginner
Parts Cost
—
Tools Needed
Soft brush or old toothbrush for scrubbing filter mesh, White vinegar for soaking mineral scale
What Does the E22 Code Mean?
The triple filter assembly is packed with food gunk, grease, or mineral scale. This is honestly the most common service call I get on the DWHD series. No parts needed, no real tools, just pull the filter and clean it. Probably takes less time than it took for the error to kill your cycle mid-wash.
Most Likely Causes
Based on aggregated repair data, here is the probability breakdown for this error code:
Food debris accumulation in the coarse strainer and flat filter40%
Grease buildup clogging the fine filter cylinder24%
Long interval between filter cleaning cycles22%
Mineral scale from hard water restricting flow through the filter14%
Symptoms You May Notice
E22 flashing on the display, usually mid-cycle during the main wash phase, sometimes right at the start
Dishes coming out dirty, greasy, or with food still stuck to them even when the cycle finishes without stopping
A weird gurgling or straining sound from the bottom of the tub, like the pump is working way harder than it should be
Water sitting in the bottom of the tub after the cycle ends instead of draining clean
Cycle stops, tries to restart, stops again, then eventually locks out with E22
Can you reset a Thermador dishwasher to clear the E22 code?
After cleaning and reinstalling the filter correctly, press and hold the Start/Stop button for 3-5 seconds until the display clears. Then pick a fresh cycle and start it. If that doesn't clear the error, unplug the machine for 60 seconds, plug back in, and try again. If E22 comes back within the first few minutes of the new cycle, the filter isn't the only problem.
Tools Required for Diagnosis
Soft brush or old toothbrush for scrubbing filter meshWhite vinegar for soaking mineral scaleSmall bowl or basin for the vinegar soakTowels or a small sponge for residual water in the sumpFlashlight for inspecting the sump wellPhillips #2 screwdriver if you need to access the door panelMultimeter if you end up testing the wash pump motor
Diagnostic Checklist
Follow these steps in order. We start with the easiest external fixes before opening up the machine.
Frequently Asked Questions
How often should I clean the Thermador dishwasher filter?
Once a month is the official answer. In real life? If you're running it daily and not pre-rinsing dishes, do it every two weeks. I've seen filters get completely packed in 10 days in a busy kitchen. Takes 5 minutes. Set a phone reminder. Way cheaper than a $400 service call for a pump that burned out because the filter was ignored for six months.
Can E22 cause dirty dishes even without stopping the cycle?
Yes, and this is usually how people first notice something's wrong, before they ever see the actual error code. A partially clogged filter drops water pressure to the spray arms. The machine finishes, everything looks normal, but dishes come out with a film or food still stuck to them. If your Thermador has been gradually getting worse at cleaning over a few weeks, check the filter before you do anything else.
Is E22 the same as E24 on Thermador dishwashers?
Related but different. E22 is a filter blockage, water can't circulate through the wash system. E24 means the machine failed to drain. A clogged filter can actually trigger both codes because the standing water eventually trips the drain fault too. But E24 can also come from a kinked drain hose, clogged air gap, or failed drain pump. If you're seeing E24, start with the filter anyway, but also check your drain hose routing under the sink.
The filter looks clean but I still get E22. What's wrong?
Few things to check. First, confirm the filter is actually locked in properly, a loose filter still restricts flow. Second, check the impeller with the machine unplugged, it should spin freely. Third, look for debris in the sump well itself. If all of that checks out and E22 persists, you're probably looking at a failing circulation pump or a bad flow sensor. At that point you'd want a multimeter to test the pump motor windings.
What does it cost if the filter fix doesn't solve it?
If this turns into a pump job, budget $150-300 for the circulation pump part on a Thermador, depending on where you source it. Labor on top of that runs $100-200 for a typical service call. So worst case you're looking at $400-500 total. That said, in my experience maybe 5 out of 100 E22 calls actually need a pump. Clean the filter first. Every time.
Can I run the dishwasher while the filter is soaking in vinegar?
No. Don't run it without the filter installed. You'll get debris straight into the pump and turn a $0 fix into an expensive one. The vinegar soak only takes 15 minutes anyway. Just wait it out, rinse everything well so the vinegar smell doesn't transfer to your dishes, then reinstall and go.