Thermador Oven Error Codes — Complete Error Code Diagnosis Guide

Five Thermador oven codes are decoded here. F2 is over-temperature — runaway heat from a bake or broil relay welded closed, a sensor that has drifted low, or a control logic fault. F3 is the RTD probe read as an open circuit, whether the probe failed, the rear connector unseated, or a lead broke from heat fatigue. F1 is a control board or EEPROM fault, the board losing its stored configuration. F34 is the latch: a stalled motor, a cam jammed by debris, or a position switch that never reports. F7 is a stuck or shorted keypad button.

F2 and F3 are neighbours in the diagnosis even though they sound unrelated, because a sensor drifting low is one of the ways an oven ends up overheating — the control is heating toward a temperature the probe is under-reporting. The guides therefore ask for a resistance reading before any relay is condemned. F7 is worked from the outside: grease under the panel and a worn membrane behind the glass produce identical behaviour, and one of them is cleanable.

A welded relay is the reason F2 outranks the rest here. The element stays energised whatever the panel is showing, and on a professional-grade oven the cavity holds heat long after power is cut, so the breaker is the reliable stop and patience is the second step. The control board and cavity harness run at line voltage behind the rear panel, and a gas model puts a supply line in the same space. EasyBear services Thermador ovens and ranges across Sacramento and the Bay Area.