Display shows E3 and smoker will not start heating cycle.

Safety first: Disconnect power before removing any control panel screws.

How to check the ambient sensor:

• Remove the control panel bezel or front trim (usually held by Phillips screws) to access the control board area.
• Locate the small thermistor or RTD sensor mounted near the air intake or behind the control panel, connected by a two-wire harness.
• Inspect the harness for pinched or cut insulation, especially where it passes through metal openings. Repair with high-temperature wire and proper connectors if damaged.
• Unplug and reseat the sensor connector on the control board.
• Measure resistance of the sensor at room temperature and compare to the service chart if available; a reading of infinite or near-zero ohms indicates a failed sensor.
• Replace the ambient temperature sensor with a GE-compatible part if readings are out of range.
• Reassemble the control panel, restore power, and test.

If E3 remains, the control board's sensor circuit may be defective and require replacement.