Thermador Range Error Code F14

The F14 error code on a Thermador range indicates one of two distinct faults depending on the oven model. On C, CM, and CJ series ovens, F14 points to an EEPROM error within the control display PCB. The EEPROM (Electrically Erasable Programmable Read-Only Memory) is a small memory chip on the control board that stores calibration data, user settings, and operational parameters. When the control board cannot read from or write to this chip correctly, it triggers F14 and halts normal operation to prevent incorrect behavior.

On Gaggenau-platform models, the F14 code has a different meaning: an open circuit condition detected at the relay board sensor. An open sensor circuit means the electrical path between the sensor and the relay board has been broken, typically due to a failed sensor, a disconnected wire harness, or a fault on the relay board itself. This distinction matters significantly for diagnosis, as the two causes require different repair approaches.

Regardless of model variant, the first recommended diagnostic step is to inspect and replace the power or relay board. On C/CM/CJ units, a failing control display PCB is the most likely source of the EEPROM fault, as the memory chip is integrated into the board assembly. Wiring integrity between the control board and power board should also be checked, since communication errors along that path can mimic EEPROM failures. If board replacement does not resolve the code, further investigation into connected sensors and wiring harnesses is warranted.