GE Range Error Code F104

The F104 error code on a GE range indicates a loss of communication between the GPU (graphical processing unit or main control board) and the OUI (oven user interface, also referred to as the display or control panel board). These two components rely on a continuous data link, typically maintained through ribbon cables or wire harness connections, to exchange operational signals. When this communication pathway is interrupted or degraded, the control system detects the failure and triggers the F104 fault.

The most common physical cause is a loose, damaged, or improperly seated ribbon cable connecting the GPU to the OUI. These ribbon cables are thin and relatively fragile, and they can work themselves loose over time due to vibration during normal range operation. In some cases, the ribbon connector itself may have developed corrosion or a bent pin that prevents reliable data transmission. A hard power cycle sometimes clears the fault temporarily, but recurring F104 codes almost always point to a physical connection issue.

If securing the ribbon cables does not resolve the fault, the GPU or OUI board itself may be defective. A failed solder joint or damaged communication port on either board can produce the same symptom as a loose cable. Technicians should visually inspect both boards for signs of burn marks, swelling, or damaged connectors before replacing components. Testing the connection integrity and reseating ribbons is the correct first diagnostic step before ordering replacement parts.