Masterbuilt Combustion Fan Failure

Grill powers on but combustion fan does not run, resulting in poor or no flame

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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

Failed combustion fan motor, Obstruction in fan blades, Loose fan wiring connector, Faulty control board fan output

How to Fix / Troubleshooting

Safety first: Unplug the grill before accessing the fan. Moving fan blades can cause injury.

  • 1. Confirm fan not running:
    • During startup, listen for fan noise from the hopper area.
    • If silent, proceed to inspection.
  • 2. Access fan:
    • Remove the side or bottom panel of the hopper to expose the fan.
    • Check for debris or wires obstructing the blades.
  • 3. Check wiring:
    • Ensure the fan connector is firmly seated on the control board.
    • Inspect wires for burns or cuts.
  • 4. Spin test:
    • With power off, gently spin the fan blades by hand. They should move freely.
    • If stiff or seized, the fan motor is bad.
  • 5. Replace fan or board:
    • If the fan is seized or open-circuit, replace the combustion fan assembly.
    • If a known-good fan does not run and wiring is intact, replace the control board.
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Repair Difficulty

Medium 3/5

Required Part

Combustion Fan
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