Thermador Oven Error Code E312

E312 indicates that the temperature sensor built into the control module PCB has been detected as defective. This sensor monitors the electronics on the control board, not the oven cavity itself. The fault means the control system is receiving an invalid or absent signal from that onboard sensor. Resolving this error typically requires servicing or replacing the control module PCB.

It is not advisable to continue using the oven when E312 is active. The control module's PCB temperature sensor is a safety-related monitoring component, and operating without reliable thermal oversight of the control board increases the risk of undetected overheating. Until the fault is diagnosed and resolved, the oven should remain out of service.

Repair costs depend on whether the issue is a wiring or connector problem versus a failed control module PCB. Connector and wiring repairs are generally less expensive, typically in the range of $100 to $250 for a service call and labor. Replacing the control module PCB on a Thermador oven can range from $300 to $700 or more, depending on the specific model and current parts pricing. Getting a diagnostic service call first will help clarify the exact repair needed.

Some basic checks, such as inspecting wiring harness connectors for looseness or corrosion, can be done by a knowledgeable DIYer. However, because the faulty sensor is integrated into the control module PCB, a true repair almost always means replacing the entire control board. Working with oven control boards involves handling components connected to line voltage, so professional service is strongly recommended if you are not experienced with appliance electronics.

A power reset, such as turning off the circuit breaker for several minutes, may temporarily clear the error code. However, if the control module PCB temperature sensor is genuinely defective, the code will return once the oven resumes operation. A reset does not address the underlying hardware fault and should not be treated as a fix.