Thermador Oven Error E309

⚡ Quick Answer: The Thermador oven error E309 signals a malfunction in the electronic oven control board, often leading to erratic temperature readings and inconsiste... ✅ DIY Fixable

What Does Error E309 Mean?

The Thermador oven error E309 signals a malfunction in the electronic oven control board, often leading to erratic temperature readings and inconsistent cooking performance. This issue can manifest as the oven displaying E309 on the control panel, beeping, and having unavailable or unpredictable cooking functions.

Common Symptoms:

  • Oven displays E309 on the control panel
  • Oven may not operate normally or may beep along with the error
  • Cooking functions may be unavailable or unpredictable

Possible Causes

  • Electronic oven control board failure (medium)

How to Fix Error E309

DIY Fix Basic check and power reset

  1. Press a key (such as TIMERS) to stop any beeping.
  2. Turn off the oven and disconnect power (unplug or switch off circuit breaker).
  3. Wait 5 minutes to allow all electronics to discharge.
  4. Restore power and see if the E309 code returns.

Technician Only Control board diagnosis and replacement

  1. Disconnect all power to the oven.
  2. Access the oven’s main control board (technician-level service).
  3. Use a multimeter and service manual to verify control board faults and related sensor/connector integrity.
  4. Replace the control board if diagnostics confirm failure.
  5. Reassemble and test oven operation.

Parts needed: Oven electronic control board, Possibly associated wiring harnesses

🛑 When to Call a Pro:
  • If the error returns after power reset
  • If there is any burning smell, smoke, or signs of electrical damage
  • If you are not comfortable performing internal diagnostics

Technical Specifications

wattage
component Temperature Sensor
resistance 1000-1100 ohms
part_number 00619670
voltage_rating 240V AC

Common Questions

What does E309 error mean on thermador oven?

E309 indicates a malfunction in the electronic control board, causing erratic temperature readings.

Can I fix thermador oven E309 error myself?

Yes, perform a basic check and power reset by turning off the oven, disconnecting power, and waiting 5 minutes.

How much does it cost to fix E309 error?

The estimated repair cost for E309 is $250–$600+, depending on parts and labor.

When should I call a technician for E309?

Call a technician if the error returns after a reset, if there are burning smells, or if you are uncomfortable with diagnostics.

Sources & References

Data last verified: 2026-07-07

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