Thermador Oven Error Code E15

E15 on a Thermador oven indicates an internal problem with the Dreefs control board, which is the main electronic control used in earlier Thermador models. When this fault occurs, the error code becomes locked in the COOK MODE display window and the oven becomes completely unusable. The board has detected a fault within its own circuitry and cannot recover on its own. Replacing the control board is the required repair.

No, resetting the oven by cycling the power or using the control panel will not clear the E15 error. The fault is generated internally by the Dreefs control board itself and persists in the COOK MODE window regardless of reset attempts. The error will remain until the faulty control board is replaced.

The cost to repair an E15 error on a Thermador oven depends on the price of the replacement Dreefs control board and any labor charges if a technician is hired. Control board replacements for Thermador ovens typically range from $200 to $600 or more for the part alone, depending on the specific model. Adding professional labor can bring the total repair cost to somewhere between $300 and $800 or higher depending on your area and service provider.

If you are comfortable working with appliance electronics and can safely disconnect power to the unit, replacing the control board is a task some experienced DIYers can perform. The key steps involve sourcing the correct replacement Dreefs control board for your specific Thermador model, disconnecting power, and carefully transferring all wiring harness connectors to the new board. If you are unfamiliar with appliance electronics, a qualified technician is recommended.

When E15 is active, the oven is non-functional and cannot be operated, so there is no immediate safety risk from continued use since the appliance will not respond to commands. However, you should avoid attempting to bypass the fault or force the oven to operate. Disconnect power to the unit if you are concerned about the board fault causing any electrical issue while awaiting repair.