Thermador error code · E22
Thermador Dishwasher Error E22: Filter / Drain Restriction
Thermador dishwasher E22 means the filter or drain sump is clogged and water cannot circulate or drain. Clean the cup filter and sump to clear it.
Thermador dishwasher error E22 means the filter and sump area is clogged so water cannot drain or circulate properly. In most cases cleaning the cup-shaped filter assembly and clearing food debris from the sump clears the code.
The meaning of E22
E22 is a filtration and drainage fault on the Bosch-platform control. The fine and coarse filters at the bottom of the tub trap food soil; when they clog, water cannot pass to the pump and the control senses that the level is not dropping during the drain phase. The machine reports E22 to flag the restriction at the filter rather than a failed pump motor.
Signs of E22
- E22 shown during or after the drain phase
- Water not draining fully, leaving residue in the tub bottom
- Visibly clogged or greasy filter when the lower rack is removed
- Poor wash results and gritty residue left on dishes
- Foul odor from trapped food in the sump
Most-likely causes
- Clogged cup-shaped filter assembly (coarse and fine filters)
- Food debris, glass, or labels lodged in the sump or pump intake
- Filter not seated or twisted-lock not engaged after cleaning
- Grease and hard-water scale narrowing the drain channel
- Carryover standing water hardening into residue
The part usually behind E22
- Filter assembly — Replace if the mesh is torn or warped and no longer seals or filters properly
- Sump / drain pump intake — Replace only if debris damaged the impeller or the sump cannot be fully cleared
Root causes behind E22
It happens when the filter is not cleaned regularly and packs with food particles, grease, paper labels, glass chips, or hard-water scale. Running heavily soiled dishes without scraping accelerates buildup. A displaced or improperly reinstalled filter can also let large debris jam the sump or pump intake. Standing water from a previous incomplete cycle leaves residue that hardens.
Safe owner checks
- Power off at the breaker, remove the lower rack, and twist out the cylindrical filter assembly
- Rinse the coarse and fine filters under hot water and scrub with a soft brush to remove grease and food
- Check the open sump for glass, labels, or debris and remove by hand
- Reinstall the filter and twist-lock it fully, then run a rinse cycle to confirm
When professional service is needed
E22 is usually owner-clearable: a thorough filter and sump cleaning resolves most cases, and Thermador recommends regular filter cleaning as routine maintenance. Call a technician only if the code persists after cleaning, which suggests a deeper sump blockage or a pump problem requiring disassembly.
Frequently asked
Common questions about Thermador E22
What does E22 mean on a Thermador dishwasher?
It means the filter and sump are clogged so water cannot circulate and drain properly. The control flags the restriction. Cleaning the filter assembly usually clears it.
Can I fix E22 myself?
Yes, in most cases. Remove the lower rack, twist out the cup filter, rinse and scrub the coarse and fine filters, clear any debris from the sump, reinstall the filter fully, and run a rinse cycle.
How do I reset the E22 code after cleaning?
Once the filter and sump are clear, run a short rinse or drain cycle; the code clears when water drains normally. A power cycle at the breaker can help it re-initialize.
How often should I clean the filter to prevent E22?
Rinse the filter every couple of weeks under normal use, more often if you do not pre-scrape dishes. Regular cleaning is the single best way to prevent E22 and improve wash results.
What if E22 comes back after I clean the filter?
A recurring E22 points to debris lodged deeper in the sump or pump intake, or a partial pump issue, which needs a technician to access and clear. A torn filter can also stop sealing and should be replaced.
Is E22 serious?
It is low severity and not a safety risk, but it stops the dishwasher from working well and can cause odors. Cleaning the filter promptly usually solves it. If you want it handled, our diagnostic visit is a flat $89; call (650) 668-1554.
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