Thermador Cooktop Error Code E0302

E0302 indicates that the EEPROM memory on the right ADB relay board has become corrupted beyond recovery. The microcontroller on that board can no longer read or use the data stored in its internal memory. This prevents the right side of the cooktop from operating correctly. The board must be replaced to clear this fault.

No, a reset will not clear E0302. The error is caused by permanent EEPROM memory corruption on the right relay board, which cannot be repaired by cycling power or performing a soft reset. The fault will return immediately because the underlying hardware failure remains present. Board replacement is the only resolution.

Repair costs will vary depending on your region and the service provider, but typically include the cost of the replacement right ADB relay board plus labor. Parts and labor combined generally fall in the range of $200 to $500 or more, depending on parts availability and technician rates. Getting a diagnostic estimate from a certified technician before authorizing the repair is advisable.

Replacing the right ADB relay board is the required repair for E0302, and it involves working with the internal components of the cooktop. A technician with appliance repair experience can perform this replacement, but because it involves electrical components and disassembly of the unit, it is generally recommended to have a qualified technician handle the job.

It is not recommended to continue using the cooktop with E0302 active. A corrupted relay board may not control the right-side heating elements predictably, which could result in elements not shutting off correctly or behaving erratically. Discontinue use until the right ADB relay board has been replaced.