Thermador Cooktop Error Code E013B

Error code E013B on a Thermador induction cooktop indicates a fault within the left ADB (Automatic Distribution Board) related to the inductor activation relay. Specifically, the control system has detected that it cannot complete a connection or disconnection command to one of the inductors controlled by this board. The ADB is responsible for routing power to the induction coils beneath the cooking surface, and the relay that switches individual inductors on and off is a critical component in this chain. When the relay fails to respond as expected, the system registers E013B to flag the breakdown in communication or switching capability.

The most common origin of this fault is a physical connection problem between the inductors and the ADB. Loose, corroded, or improperly seated wiring harness connectors can prevent the relay from completing the circuit reliably. In some cases, a relay on the ADB itself may have failed due to overheating, electrical surge, or normal wear over time. A damaged induction coil presenting abnormal resistance to the board can also cause the relay to register a fault, since the module may interpret the irregular load as an inability to connect or disconnect.

Because the fault is localized to the left ADB, diagnostics should be focused on that specific module and its associated components. Begin by confirming that all wiring harnesses running from the inductors to the left ADB are fully seated and free from visible damage. If connections are secure and the error persists, the ADB board itself or the affected inductor coil may require further testing or replacement. This is not a fault that will self-resolve through simple power cycling if a hardware failure is present.