Thermador Oven Error F12
⚡ Quick Answer: The Thermador oven F12 error code indicates a malfunction in the power relay board, which may lead to erratic temperature readings or the oven failing... ⚠️ Difficulty Varies
What Does Error F12 Mean?
The Thermador oven F12 error code indicates a malfunction in the power relay board, which may lead to erratic temperature readings or the oven failing to heat properly. If this error appears, it's crucial to check the power supply and consider contacting Thermador support, as persistent issues may require professional service for diagnosis and repair.
Common Symptoms:
- Error F12 displayed on oven control panel
- Oven may fail to start heating or operate normally
- Persistent error requiring service contact
Possible Causes
- Power relay board failure or abnormal voltage condition (low)
How to Fix Error F12
DIY Fix Basic checks and contacting Thermador support
- Turn off the oven and power at the circuit breaker.
- Wait a short period and restore power to see if the F12 code clears.
- If the code persists, contact Thermador Customer Support with the exact error code since official code definitions are not published.
Technician Only Diagnose and potentially replace power relay board
- Disconnect oven from power and ensure safe working conditions.
- Measure supply voltages and inspect the power relay board for signs of damage or abnormal voltages.
- Verify wiring connections to the main control and relay board.
- Replace the relay board if tests indicate failure, then retest the oven.
- Verify full oven operation after the component replacement.
Parts needed: Power relay board, Multimeter for voltage/testing, Screwdrivers and basic service tools
- Error persists after power cycling
- Any signs of electrical burning, smoke, or abnormal power conditions
- User lacks tools or training to diagnose internal electronics safely
Next step
Choose the next step for F12
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Most relevant component to inspect
Temperature Sensor
Monitors the internal temperature to ensure correct operation and prevent overheating.
- Typical part-only price
- $15 - $35
- DIY difficulty
- Easy
- Estimated time
- 15-30 mins
Where can I find the model number?
Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.
Verify the complete model and part number on the retailer's compatibility page before ordering.
Other parts options
Check related components first; use model search as a fallback.
Model-compatible Oven parts
Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.
Optional routine care
Maintenance supplies
These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.
Non-Scratch Cooktop Cleaner
A routine surface-care product. Confirm that it is approved for the specific glass, ceramic, enamel, or stainless finish.
Oven Thermometer
A diagnostic aid for comparing cavity temperature during a controlled check. It does not prove which internal component has failed.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.
Technical Specifications
| wattage | N/A |
|---|---|
| component | Temperature Sensor |
| resistance | 1000-1200 ohms |
| part_number | 00490530 |
| voltage_rating | 120V AC |
Common Questions
What does F12 error mean on thermador oven?
F12 indicates a power relay board malfunction, affecting heating and temperature accuracy.
Can I fix thermador oven F12 error myself?
You can try power cycling the oven, but persistent F12 errors should be addressed by a technician.
How much does it cost to fix F12 error?
Repair costs range from USD 150–400+, depending on parts and labor.
When should I call a technician for F12?
Call a technician if the error persists after power cycling or if you notice any electrical issues.
Sources & References
Data last verified: 2026-07-25
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