Thermador Oven Error Code F6

The F6 error code on a Thermador oven indicates that the control board is detecting a continuously active, or shorted, key signal coming from the touch control panel. Under normal operation, the touch control board outputs 5 VDC across its test pads when a key is being pressed and returns to 0 VDC when no key is in contact. When the system reads a sustained voltage signal with no key actually being pressed, the control interprets this as a shorted key condition and triggers the F6 fault.

This fault involves two primary components: the touch control board itself and the wiring connections between the display head and that board. A loose, corroded, or damaged connector in this signal path can cause a false voltage reading that mimics a permanently pressed key. In some cases, physical damage or internal failure within the touch control board can cause one of its key circuits to short internally, producing the same erroneous signal.

Diagnosing F6 begins with a thorough inspection of all connectors running between the display head and the touch control board. Reseating these connections and checking for damaged wiring should be completed before testing voltage at the touch control board test pads with a voltmeter. If voltage reads 5 VDC continuously with no key pressed, the fault is confirmed as a shorted key circuit, pointing toward a defective touch control board that will likely need replacement.