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

  1. Turn off the oven and power at the circuit breaker.
  2. Wait a short period and restore power to see if the F12 code clears.
  3. 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

  1. Disconnect oven from power and ensure safe working conditions.
  2. Measure supply voltages and inspect the power relay board for signs of damage or abnormal voltages.
  3. Verify wiring connections to the main control and relay board.
  4. Replace the relay board if tests indicate failure, then retest the oven.
  5. Verify full oven operation after the component replacement.

Parts needed: Power relay board, Multimeter for voltage/testing, Screwdrivers and basic service tools

🛑 When to Call a Pro:
  • 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

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: 2026-07-07

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