Bosch Range Error Code F155

F155 indicates that the cook profile stored in the range's EPROM memory chip has become corrupted. The control board detects this corruption within 1 second of a cook or clean cycle being programmed and triggers the fault code to stop the cycle. This is a control board memory issue, not a problem with the oven's heating elements or sensors. Resolving it typically requires replacing the electronic control board.

A power reset, such as unplugging the range or tripping the circuit breaker for several minutes, may temporarily clear the code. However, because the underlying cause is corrupted data in the EPROM, the F155 error will almost certainly return as soon as a cook or clean cycle is initiated. A reset alone does not repair the memory or the control board.

The primary repair is typically an electronic control board replacement. Parts costs for Bosch range control boards generally range from around $150 to $400 depending on the specific model. If a technician performs the repair, labor costs typically add $100 to $200 to the total, though rates vary by region and service provider.

Because the fault is rooted in corrupted EPROM memory on the control board, there is no field-level repair for the chip itself. A knowledgeable DIYer can replace the electronic control board if they are comfortable working with appliance electronics and disconnecting power safely. However, diagnosing whether a power supply issue contributed to the corruption should be done first to avoid damaging a new board.

The F155 fault specifically prevents cook and clean cycles from operating correctly, so those functions should not be relied upon while the code is active. Using the range in this condition risks incomplete or uncontrolled operation of heating elements. It is best to resolve the fault before using oven or self-clean functions.