Control panel displays Er2 and grill shuts down or will not start

Safety first: Disconnect power and let the grill cool completely before inspection.

• Step 1 – Inspect RTD cable routing: Follow the RTD cable from the probe in the cook chamber to the controller. Look for spots where the cable may have melted against the firebox, exhaust, or drip tray. If insulation is melted and conductors are touching, the probe is shorted and must be replaced.
• Step 2 – Check for moisture: At the controller, unplug the RTD connector from the main control board. Inspect for moisture, grease, or corrosion. Dry the connector thoroughly and clean with electrical contact cleaner if available.
• Step 3 – Multimeter test: With the RTD disconnected, measure resistance between each RTD lead and the metal body of the grill. Any reading close to 0 ohms indicates a short to ground. Also measure resistance between the two RTD leads; a reading near 0 ohms (dead short) indicates a failed probe.
• Step 4 – Replace RTD probe: If testing confirms a short, remove the RTD mounting screw(s) inside the cook box, pull the cable out through the grommet, disconnect from the controller, and install a new Monument RTD temperature probe. Route the cable away from hot surfaces and secure with high‑temp clips or ties.
• Step 5 – Reassemble and test: Reconnect the RTD to the controller, reinstall the control panel, plug in the grill, and power on. Confirm that Er2 is cleared and that the displayed temperature responds when the probe is warmed slightly.
• When to seek service: If a known‑good RTD still triggers Er2, the main control board RTD input circuit is likely damaged and the board should be replaced.