Kenmore Range Error Code F500

The F500 error code on a Kenmore range indicates a loss of LIN (Local Interconnect Network) bus communication between the Electronic Oven Control (EOC) and the Electronic Surface Element Control (ESEC). The LIN bus is a serial communication protocol used to pass control signals and status data between these two control boards. When communication is interrupted or fails entirely, the EOC can no longer coordinate with the ESEC, triggering the F500 fault and typically disabling affected cooking functions as a safety precaution.

The communication link between the EOC and the ESEC runs through a dedicated wiring harness, specifically the wire connected between pin connector P4 on the EOC and pin connector P7 on the UIB (User Interface Board). A break, short, corrosion, or loose connection anywhere along this wire is the most frequent cause of the error. Because this is a serial communication line, even minor resistance increases from a corroded terminal or damaged insulation can disrupt data transmission and trigger the fault.

If the communication wire checks out visually and electrically, the fault points to a failed EOC or UIB. These boards contain the LIN bus transceivers responsible for encoding and decoding the communication signal. A failed transceiver on either board will sever the link even when the wiring is intact. The diagnostic sequence calls for replacing the EOC first, then the UIB if the error persists, since the EOC initiates and governs the LIN bus communication in this configuration.