Thermador Cooktop Error Code C2

C2 indicates a communication error between the Main Board and the ADB (Auxiliary Distribution Board) inside your cooktop. The two boards cannot exchange signals properly, which prevents normal operation. This fault is most often caused by a defective or disconnected wire harness between the two boards.

A power reset by switching off the circuit breaker for 60 seconds may temporarily clear the C2 code, but it will return if the underlying wiring or connection issue is not corrected. The reset does not repair a damaged harness or faulty board, so the fault should be diagnosed and repaired rather than relying on resets.

Repair costs vary depending on the cause. If only the wire harness needs replacement, parts and labor typically range from around $100 to $250. If a control board such as the ADB or MB requires replacement, costs can range from $200 to $600 or more depending on parts pricing and local labor rates. Getting a diagnostic assessment from a technician before committing to parts replacement is advisable.

A knowledgeable DIYer comfortable working with appliance wiring can attempt to inspect and reseat the connectors between the MB and ADB boards. However, accessing these boards requires disassembling the cooktop, and working near electrical components carries risk. If connector reseating does not resolve the fault, a technician should handle harness replacement or board diagnostics.

You should not continue using the cooktop while C2 is active. A communication failure between the MB and ADB means the cooktop cannot reliably coordinate control signals, which can lead to unpredictable behavior. Discontinue use until the fault has been diagnosed and repaired.