Grill displays E3 and shuts down; temperature overshoots setpoint or climbs rapidly beyond target.

Safety first: If you suspect a grease fire, do not open the lid fully. Turn the grill off, unplug it, and keep the lid closed until the fire subsides. Have a Class B fire extinguisher nearby. Never use water on a grease fire.

• Allow full cool-down: Leave the grill off and closed until it is completely cool to the touch before inspecting.
• Clean grease and ash: Remove grates and heat baffles. Scrape and remove built-up grease from the drip tray, grease channel, and cookbox. Empty and clean the grease tray and bucket. Vacuum ash from the fire pot and surrounding area.
• Inspect RTD temperature probe: Locate the temperature sensor (usually a metal rod on the interior side wall). Check for heavy carbon buildup, physical damage, or loose mounting. Clean gently with a non-abrasive pad.
• Check probe wiring: Follow the probe wires to the control board. Ensure the connector is secure and wires are not pinched or melted.
• Test probe (if possible): With a multimeter, measure resistance at room temperature and compare to Weber’s RTD spec (commonly around 1000Ω at 0°C for PT1000-type, but verify for your model). A shorted or open probe will cause incorrect readings and may trigger E3.
• Inspect control board: Look for signs of a stuck auger relay (burn marks, melted plastic). If pellets continue to feed when the grill is off, unplug immediately and replace the control board.
• After cleaning and checks: Restart the grill with a small pellet load and monitor temperature closely. If E3 recurs, replace the RTD temperature probe first; if still unresolved, replace the control board.