Uneven cooking with hot spots and cold spots across the grate

Safety first: Use heat-resistant gloves when adjusting parts on a warm grill.

• 1. Verify diffuser placement:
  • Ensure the heat diffuser/deflector plate is installed in the correct orientation per Masterbuilt manual.
  • Reseat it so it sits flat and centered over the fire pot.
• 2. Clean airflow paths:
  • Remove heavy grease from the diffuser and barrel walls.
  • Ensure side and rear convection paths are not blocked.
• 3. Rotate food and use zones:
  • Identify hotter and cooler areas with a biscuit test or multiple thermometers.
  • Place sensitive foods in more even zones.
• 4. Replace damaged diffuser:
  • If the diffuser is warped or burned through, replace the heat diffuser plate.