Display shows ERR when setting temperature or timer, beeping; the function will not start.

Safety first: Ensure oven is off before troubleshooting.

• Reset settings: Cancel all functions. Re-enter the desired mode and set a temperature within the recommended range (e.g., 120–500°F / 50–260°C).
• Check timer format: Ensure you are entering time in the correct format (minutes vs hours) as per the manual.
• Clean control surface: Wipe the touch panel with a dry, soft cloth to remove grease or moisture that may interfere with touch sensing.
• Power cycle: Turn off power at the breaker for a few minutes, then restore and test again.
• Inspect control knob (if present): For models with rotary encoder knobs, ensure the knob is not cracked or slipping on the shaft. Replace the knob or encoder if inputs are erratic.

Note: Persistent ERR messages with valid inputs may indicate a failing user interface board.