Masterbuilt Failed Cabinet Light Circuit

Interior light does not turn on, but smoker heats and controls work normally.

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Possible Causes

Burned-out light bulb or LED module, Loose light wiring connector, Failed light switch or control output, Moisture damage to light assembly

How to Fix / Troubleshooting

Safety first: Unplug the smoker before working on the light. Allow the interior to cool.

  • Check bulb or LED: If your model uses a replaceable bulb, remove and inspect it. Replace with the correct type if the filament is broken or the bulb is darkened.
  • Inspect wiring: Access the light assembly from inside or behind the cabinet. Ensure the connectors are tight and free of corrosion.
  • Test switch or control: If there is a dedicated light button, verify it clicks and that the control board is sending power to the light when pressed (use a multimeter if qualified).
  • Replace light assembly: If the LED module or housing is sealed and non-serviceable, replace the entire light assembly with an OEM part.
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Repair Difficulty

Easy 2/5

Required Part

Cabinet Light Assembly
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