Thermador Cooktop Error Code E0102

E0102 indicates that the EEPROM memory inside the microcontroller on the left ADB relay board has become corrupted beyond recovery. This memory stores critical operational data needed to control the left burner zones. Because the corruption is classified as unrecoverable, the board cannot restore itself to a functional state. Replacement of the left relay board is the required repair.

It is not advisable to use the cooktop while E0102 is active. The left ADB relay board controls switching functions for the left burner zones, and with corrupted control logic, relay behavior can become unpredictable. Continued use could pose a safety risk or cause additional damage to connected components. The cooktop should be taken out of service until the relay board is replaced.

A knowledgeable DIYer who is comfortable working with appliance electronics can replace the left ADB relay board, provided the cooktop is fully disconnected from power before beginning any work. The repair involves accessing the board, disconnecting wiring harnesses, and installing the replacement unit. However, if you are not confident working around high-voltage components, a qualified appliance technician should perform the replacement to ensure safety and correct installation.

No, a simple reset will not clear E0102. The error reflects permanent EEPROM corruption inside the relay board's microcontroller, meaning the stored data cannot be restored by cycling power or performing a soft reset. The fault will return each time the cooktop attempts to initialize the left relay board. Board replacement is the only effective resolution.

The cost to repair E0102 depends on whether you use a professional technician or source and install the part yourself. The left ADB relay board part cost typically falls in the range of $150 to $400 depending on the specific cooktop model. Professional labor for diagnosis and board replacement can add $100 to $250 or more. Total repair costs generally range from $250 to $650.