Display shows E7 and the smoker will not maintain set temperature, often fluctuating widely or shutting down.

Safety first: Unplug the smoker and allow it to cool before accessing sensors.

Steps to check secondary sensor:

• Identify the second sensor: Some Landmann models use a second NTC sensor near the exhaust or in the control housing. Refer to your model layout to locate it.
• Inspect wiring: Follow the sensor leads to the control board. Look for pinched, cut, or melted insulation. Repair or replace damaged wiring.
• Check connectors: Reseat the sensor plug on the control board. Clean any corrosion with contact cleaner.
• Test resistance: Disconnect the sensor and measure resistance at room temperature. Compare to the main cabinet sensor; they should be similar if they are the same type. Replace if open, shorted, or far out of spec.
• Reassemble and test: After replacing or reconnecting, reassemble panels and test for stable temperature control without E7.

Note: If the sensor is good but E7 remains, the control board’s secondary sensor circuit is likely defective and the board should be replaced.