Masterbuilt Incomplete Combustion / Poor Airflow

Heavy white smoke and sooty buildup on food and inside grill

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Possible Causes

Combustion fan running slow, Fire pot overloaded with pellets, Exhaust vent partially blocked, Wet pellets producing steam and smoke

How to Fix / Troubleshooting

Safety first: Operate the grill outdoors in a well-ventilated area only.

  • 1. Check pellets:
    • Discard any pellets that are swollen or crumble easily.
  • 2. Clean fire pot:
    • Vacuum ash and ensure air holes are open.
    • Do not manually overfill the fire pot with pellets.
  • 3. Inspect exhaust:
    • Check the chimney cap and exhaust path for grease or soot buildup.
    • Clean with a non-flammable degreaser and brush.
  • 4. Verify fan speed:
    • Listen for strong airflow from the combustion fan.
    • If airflow is weak, clean the fan blades and intake; replace the combustion fan if needed.
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Repair Difficulty

Easy 2/5

Required Part

Combustion Fan
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