Gaggenau Oven Error Code F23

F23 indicates that the relay electronics cannot be selected by the control system. The fault is caused by either no contact at the flat cable connecting the control and relay boards, or by defective relay electronics. This fault can prevent the oven from properly activating its heating elements.

A power reset by switching off the circuit breaker for a few minutes may temporarily clear the fault code if the cause is a loose connection or a transient electronics glitch. However, if the flat cable is damaged or a board has failed, the error will return. A reset does not repair the underlying hardware fault.

Repair costs depend on which component is at fault. If only the flat cable needs reseating or replacement, costs are relatively low, typically in the range of $75 to $200 including a service call. Replacing a relay board or main control board on a Gaggenau appliance can range from $300 to $800 or more depending on parts availability and labor rates in your area.

A knowledgeable DIYer can inspect and reseat the flat cable connection, which is the most accessible first step and requires no parts. However, diagnosing and replacing a relay board or main control board involves working with internal electronics and should be handled by a qualified appliance technician to avoid further damage or safety risks.

It is not recommended to continue using the oven while F23 is active. A relay electronics fault can mean heating elements are not being controlled correctly, which could result in unpredictable heating behavior. Stop using the oven and have it inspected before resuming normal operation.