Display shows E9 and internal temperature reading is obviously incorrect (e.g., shows 300°F when cold).

Safety first: Unplug the smoker before accessing internal wiring.

• Compare with external thermometer: Place a reliable oven thermometer inside the smoker and compare readings to the display during operation.
• Inspect sensor mounting: Ensure the sensor tip is not touching the heating element or metal wall directly, which can cause false high readings. It should be exposed to air in the cooking chamber.
• Check sensor wiring and ground: Verify the sensor wires are intact and the ground connection at the control board is tight.
• Replace sensor if readings are offset: If the sensor consistently reads far off from the external thermometer, replace the temperature sensor probe.
• Replace control board if sensor is good: If a new sensor does not correct the error, the control board's ADC or calibration is likely faulty and the board should be replaced.