JennAir oven shows F1-4, may shut off heating unexpectedly

Safety: Disconnect power at the breaker before testing.

• Access sensor: Remove the oven racks and locate the temperature sensor on the rear wall. Remove its screws and gently pull it forward.
• Measure resistance: With a multimeter, measure resistance across the sensor terminals at room temperature. A reading far below 1000 ohms (or near 0 ohms) indicates a shorted sensor.
• Inspect wiring: Follow the sensor wires as far as possible. Look for spots where the insulation is melted or pinched against metal, which can cause a short.
• Check control connector: Access the control board and inspect the sensor connector for corrosion or carbon tracking between pins.
• Replace or repair: Replace the sensor if shorted. If wiring is damaged, repair with high-temperature wire and proper connectors. Replace the harness if extensively damaged.