Bosch Range Error Code F155

The F155 error code on a Bosch range indicates that the cook profile stored in the EPROM (Electrically Programmable Read-Only Memory) has become corrupted. The EPROM is a non-volatile memory chip on the control board that stores critical operational data, including cook cycle profiles, self-clean sequences, and user-programmed settings. The fault is detected specifically when a cook or clean cycle is programmed, and the control board identifies the corruption within a 1-second fault detection window. At that point, the board recognizes that the stored profile data does not match expected parameters and triggers the F155 code to prevent the range from operating on faulty instructions.

EPROM corruption can occur for several reasons. Power surges or momentary voltage fluctuations can write bad data to the chip. In some cases, the EPROM chip itself degrades over time, particularly if the control board has been exposed to heat stress or moisture. A failed or failing electronic control board is the most common hardware-level cause, since the EPROM is typically integrated into or soldered onto the main control board assembly rather than being a separately serviceable component.

Because the fault is tied directly to memory integrity rather than a sensor or wiring issue, standard continuity or resistance checks on external components will not resolve the underlying problem. The fault triggers at the moment a cook or clean cycle is initiated, making the range non-functional for those operations. Resolving F155 almost always requires replacing the electronic control board, as re-flashing or rewriting the EPROM is not a field-serviceable procedure on these units.