Grill displays Er04 and will not start; temperature reading is extremely low or shows dashes.

Safety first: Turn the grill OFF, unplug it, and ensure it is cool.

• Locate the grill temperature sensor: On Enders pellet grills, the RTD or thermocouple probe is usually mounted on the interior side wall of the cook chamber with a small metal sheath and two wires exiting to the control panel.
• Inspect the probe and wiring: Check for physical damage, cuts, or melted insulation. Ensure the probe is firmly mounted and not bent into contact with grates or food.
• Check the connector: At the back of the control panel, locate the sensor connector (often a two-wire plug). Unplug and re-seat it several times to clean the contacts. Look for corrosion or loose pins.
• Test continuity: With the grill unplugged, disconnect the sensor from the board and measure resistance across the two sensor leads. A typical RTD will show a finite resistance (e.g., 100–2000 Ω depending on type). An open reading (OL) indicates a broken sensor.
• Replace the sensor if faulty: Remove the mounting screw inside the cook chamber, gently pull the sensor and wire through the wall, and install a new Enders grill temperature sensor (RTD probe). Route the cable along the original path and secure it away from direct flame.
• Re-test: Reconnect the sensor to the control board, power up the grill, and verify that the displayed temperature is reasonable for ambient conditions and that Er04 is cleared.

If a known-good sensor still triggers Er04, the temperature input circuit on the control board may be defective.