Older Thermador 30-Inch Range Cancels Cooking with F8 (Supervisory Error)

What F8 means

F8 on a legacy ESC30 or GSC30 range is a supervisory error between the analog and digital sides of the control, and it cancels the current cook mode so the oven stops heating. The legacy document says to reset with the Cancel key and replace the clock assembly if it persists. Newer Thermador units show F8 differently.

Usual causes of F8

Analog/digital supervisory error in the control
Clock assembly failing if it repeats

✓ A safe check worth trying

1. Press Cancel to clear the message. 2. Set the oven again from scratch. 3. If F8 reappears during cooking, turn the oven off. 4. Call us to look at the clock assembly rather than restarting dinner again and again.

! Why you should stop here

The assembly is replaced as a unit, not repaired at home.
Repeated canceled cooking can ruin meals.
The price is written before work.

Taking off a panel yourself does not by default void a manufacturer warranty, yet it can lead to accidental damage, and some manufacturers attach their own service terms. Read your warranty paperwork, or ask us, before you decide.

→Same appliance

More Range codes

E4Thermador Pro-Harmony Range Showing E4 and Light Code 12: Shorted Oven Sensor F9Legacy Thermador ESC30/GSC30 Range with F9: Door Latch Supervisory Error E5Legacy Pro-Harmony Thermador Range E5 Means Potentiometer Failure (Light Code 21) F1Legacy RDF/REF 30-Inch Range F1: Stuck Buttons or Latch Switch E6Thermador PDR/PRG Range E6, Blue Lights 3-then-2: Over Temperature While Cooking F3Legacy RDF/REF 30-Inch Range F3: Open or Shorted Oven Sensor E7Cleaning Cycle Stopped by E7 on a Legacy Thermador Pro-Harmony Range (Code 23) E7010Thermador Induction Range Cooktop E7010: Wi-Fi or Hood Connection Lost

F8F8 questions

Why did my cooking stop?

F8 cancels cook mode as a precaution. The supervisor found a mismatch and chose to stop heating rather than continue unchecked. Cooking can restart after a reset.

Will Cancel always fix it?

Sometimes it clears for a while. If it returns, the legacy document points to replacing the clock assembly, and we confirm that on site. Replacement is the last step.

Is it related to F9?

Both are supervisory but different: F9 relates to the door latch and cancels clean mode. Use the exact code you see when you call us.