Error Code
Thermador Oven E12 Error Code
E12 on a Thermador oven is generally linked to a possible control-electronics problem. This guide gives a plain-language overview, the symptoms you might notice, safe checks you can perform, and when it is best to call a technician — with a reminder that exact behavior varies by model.
Reviewed by Daniel Reeves · Last reviewed August 18, 2026
Error guide
Code overview
Quick answer — E12 — commonly associated with an electronics issue on a Thermador oven. Meaning can vary by model; verify before relying on it.
On many Thermador oven models, the E12 code is commonly associated with a possible control-electronics problem. The exact meaning can differ between appliance series and model years, so treat this as general guidance and confirm it against your specific model’s documentation before acting.
Model note: ASKO reuses codes across series and model years, so E12 may mean something different on another appliance or generation. Confirm against your model’s documentation and record the full model number before acting.
- Error code: E12
- Appliance: Oven
What to look for
Symptoms you may notice
These are the signs homeowners often see when E12 appears on an ASKO appliance.
- The oven shows E12 and controls act erratically
- E12 appears at power-on
- Programs won’t start reliably with E12
Why it happens
Possible causes
Exact meaning can vary by model — treat these as common associations, not a final diagnosis.
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A control-board fault
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A power or wiring irregularity
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A firmware or electronics glitch
Before you call
Safe checks you can make
Simple, non-hazardous checks only. If anything is unclear, stop and contact a technician.
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Confirm stable power at the outlet
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Perform a manufacturer-approved restart once
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Record the full model number
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Record the full model number before contacting a technician
Safety first
Important safety warning
Do not open internal panels, access high-voltage wiring, or bypass any safety device. If you ever smell gas, stop immediately, do not operate any switches, leave the area and contact your gas provider and a qualified technician. If you see smoke, sparks, a burning smell, or water near electrical parts, switch the appliance off at the outlet if it is safe to do so and call a professional.
Please avoid
What not to attempt
Get help
When to call a technician
If E12 persists after the safe checks above, or you are unsure at any point, book a diagnosis. A technician can confirm what E12 means on your specific model and resolve the underlying cause safely.
Likely related component:
Often related to the control board (varies by model).
References
Sources & references
- Thermador appliance user manual — error/display messages section
FAQ
Frequently asked questions
Quick answers about E12, safe checks, and when to book a technician.
02 answers
You can safely try the basic checks above and a manufacturer-approved restart. If E12 returns, the underlying cause needs a proper diagnosis. Because the meaning can vary by model, confirm against your documentation.
Not necessarily. Thermador reuses codes across series and model years, and the exact meaning can differ. Record your full model number so the code can be interpreted correctly.
Book a repair
Tell us about your ASKO we’ll take it from there
Share your model and that you are seeing E12 — we’ll confirm an appointment. Prefer to talk? Call us and we’ll help right away.
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