Masterbuilt Backdraft / Hopper Burn-Back

Pellets back-burning into hopper (smoke or smoldering pellets in hopper)

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Excessive negative pressure in hopper, Auger tube packed with burning pellets, Fan not maintaining proper airflow direction, Grill shut down without proper cool-down cycle

How to Fix / Troubleshooting

Safety first: If you see smoke from the hopper, unplug the grill immediately and keep the hopper lid closed. Use a fire extinguisher if flames appear. Do not use water.

  • 1. Allow to cool completely:
    • Do not open the hopper until all smoke stops and the unit is cool.
  • 2. Remove pellets:
    • Once cool, empty the hopper and auger tube of all pellets.
  • 3. Inspect auger and fire pot:
    • Check for charring or damage in the auger tube.
    • Clean the fire pot and surrounding area.
  • 4. Verify shutdown procedure:
    • Always allow the grill to complete its automatic cool-down cycle before unplugging.
  • 5. Check fan and seals:
    • Ensure the combustion fan runs during shutdown.
    • Inspect for air leaks that could reverse airflow; repair as needed.
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Repair Difficulty

Hard 4/5

Required Part

Auger Assembly
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