Thermador Cooktop Error Code E013B

E013B indicates that the left ADB (Automatic Distribution Board) has detected a fault with the inductor activation relay, meaning it cannot properly connect or disconnect one of the induction coils on the left side of the cooktop. The ADB is the control board responsible for switching power to the individual induction burners. This fault points to a problem in the wiring, the relay, the board itself, or the coil it is trying to control.

It is not recommended to continue using the cooktop while E013B is active. The affected inductor may not respond predictably to on and off commands, which could result in uncontrolled heating behavior. Discontinue use of the affected burner and have the unit inspected before resuming normal operation.

Repair costs vary depending on the root cause. If the issue is simply a loose wiring harness, the cost may be limited to a service call fee, typically in the range of $75 to $150. If the left ADB requires replacement, parts and labor combined can range from $300 to $600 or more depending on parts availability and regional labor rates. An induction coil replacement would fall in a similar cost range.

The first step, checking that the inductor wiring harnesses are properly connected to the left ADB, can be performed by a confident DIYer comfortable working inside appliances with power disconnected. However, if the fault persists after confirming connections, further diagnosis and component replacement involving the ADB or induction coil should be handled by a qualified appliance technician due to the high-voltage components involved in induction cooktops.

A power reset may temporarily clear the code, but if the underlying hardware fault remains, such as a failed relay, damaged ADB, or loose connection, the error will return when the affected burner is used. A reset alone is not a fix and should only be used as a diagnostic step to confirm whether the fault is persistent or intermittent.