Thermador Oven F4 Error Code: Causes and Fixes
Quick answer: Sensor short circuit
What you’ll notice
Oven shows F4; temperature sensor circuit is shorted.
Thermador
Oven
Code F4
medium severity
Thermador models: Thermador professional ranges use Star Burners on gas models and an ExtraLow simmer feature. The oven temperature probe is at the rear cavity wall. Thermador wall ovens have a Soft Close door mechanism; if the oven door does not latch cleanly for self-clean, check whether the closer mechanism has disengaged.
Common causes
- RTD probe wire insulation has melted and is touching the chassis
- Moisture in the connector causing a short
Step-by-step fix
- Test the probe resistance — near zero (short) confirms the fault.
- Inspect the wire for any contact with the oven cavity walls or heating element.
- Replace the temperature probe.
Tools you may need
MultimeterScrewdriver set
Prevention
- Route the probe wire away from the broil element when reinstalling.
When to stop DIY
Same as F3 — if the probe tests good, the harness or board has the fault.
FAQ
What does F4 mean on Thermador oven?
F4 usually indicates: Sensor short circuit.
Can I keep using the appliance with F4?
Use caution. Severity is medium. Same as F3 — if the probe tests good, the harness or board has the fault.
How long does this fix usually take?
Typical first-pass troubleshooting takes 20–30 minutes.