Thermador Oven Error Code E122

E122 indicates that the meat probe sensor circuit for the upper or single oven cavity has detected a temperature reading that is too high or a short circuit condition. The control board monitors resistance from the probe circuit, and when that value falls outside acceptable limits, the code is displayed. The most common causes include a damaged probe, a faulty receptacle, or a wiring harness problem. Checking the probe receptacle and connected harness is the recommended first diagnostic step.

The E122 code specifically affects the meat probe circuit, so standard baking and broiling functions may still operate depending on how the oven handles the fault. However, using an appliance while an active error code is present is not recommended, as the underlying short circuit condition could affect other control functions. Diagnosing and resolving the fault before continued use is the safest approach.

Repair costs vary depending on which component has failed. A replacement meat probe is generally the least expensive fix, typically ranging from around $30 to $80 for the part. Receptacle or harness repairs can range from $100 to $250 when labor is included. Control board replacement is the most expensive scenario, with total costs potentially ranging from $300 to $600 or more depending on the specific model and labor rates in your area.

Some causes of E122 are DIY-accessible, such as replacing a damaged meat probe or cleaning corroded receptacle contacts. If the problem lies in the wiring harness or the control board, those repairs are more complex and generally require disassembling part of the oven, so a qualified technician is recommended for those steps. Always disconnect power to the oven before inspecting any internal wiring or components.

Resetting the oven by cutting power at the circuit breaker for a few minutes may temporarily clear the E122 code, but if the underlying fault in the probe, receptacle, or harness is still present, the code will return. A reset alone does not repair a shorted probe or damaged wiring. The physical cause must be identified and corrected for the code to be permanently resolved.