Kenmore Range Error Code 77

Error code 77 on a Kenmore induction range indicates a break or open circuit condition in the heat sink temperature sensor located within the right side induction housing assembly. The heat sink temperature sensor is a critical safety and control component that monitors thermal conditions on the generator circuit board responsible for powering the right side cooking zones. When this sensor signal is lost or reads outside the expected range due to a wire break or sensor failure, the control system triggers error 77 and disables the affected cooking zones to prevent uncontrolled overheating.

The right side generator circuit board contains the induction electronics, power switching components, and the integrated or attached heat sink sensor that feeds real-time temperature data back to the main control. A break in this sensor circuit can result from a failed sensor element, a fractured sensor lead wire, a corroded or disconnected connector, or an internal failure within the generator board itself. Because the sensor and its associated circuitry are housed within the induction assembly, diagnosing the precise failure point often requires inspecting the wiring harness connections at the board before condemning the component.

The recommended first diagnostic step is replacement of the right side generator circuit board. This is because the sensor is typically integrated with or directly mounted to the board, making board replacement the most direct corrective action. Before replacing the board, technicians should visually inspect the wiring harness and connectors between the board and the main control for obvious damage, corrosion, or disconnection. If connections are intact and undamaged, the generator circuit board is the primary suspect and should be replaced.