F4 on Older Thermador ESC30/GSC30 Ranges Means a Shorted Oven Sensor

What F4 means

On older ESC30 and GSC30 ranges, F4 appears when the control sees the oven sensor circuit as shorted, as if its wires touched. That leaves the range blind to cavity temperature. The legacy notes suggest a bad sensor or pinched sensor leads, then the same sensor checks listed for F2. Newer Thermador units show F4 with another meaning.

Usual causes of F4

Bad oven sensor
Pinched sensor leads

✓ A safe check worth trying

1. Switch the oven off and let it cool. 2. Look only at what is visible: is a cord or object pressed against the back of the range? 3. Do not pull the range out by yourself. 4. Restore breaker power and call us if F4 returns.

! Why you should stop here

Pinched leads sit behind the panels.
A short can also point to damaged insulation, found only with testing.
A written quote comes before any repair.

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

F4F4 questions

What does shorted mean here?

It means the sensor wires are making a connection that bypasses the sensor itself. The control then reads a temperature that makes no sense and shows F4.

Can moving the range cause it?

A pinched lead is one of the listed causes, so a recent move or reinstallation is worth mentioning when you call. We check the leads along with the sensor.

Do I need to replace the whole oven?

Not based on this code. The source points to the sensor or its leads, and we quote the exact repair in writing so you can decide.