Welcome

If your Masterbuilt™ Digital Charcoal Smoker controller is not functioning properly, there is potential that the unit is not wired correctly.

You may notice these possible issues:

  • Your controller restarts immediately after you set the temperature
  • Your controller is reading the wrong or inaccurate temperature
  • Your controller may not turn on at all

Please review the following document to ensure you have connected the wires on your Digital Charcoal Smoker properly.

Applied Products

40-inch Digital Charcoal Smoker
MB20060321
MB20061321

My Controller Isn't Functioning Correctly

Do This First

Reset Your Controller
  1. Power OFF your cooking device.
  2. Unplug your cooking device from the wall.
  3. Wait 5 minutes, plug it back in.
  4. Your controller is reset - check to see if problem persists.
Update Your App
Make sure your App is updated on your smartphone. If there is an App update, install the new version now.
Update Your Controller
  • Make sure you are running the most current Firmware version.
  • To check for the most current firmware version please refer to the App Device Requirements page
Check Your Temperature Sensor
  • Power OFF your cooking device.
  • Your temperature sensor may not be plugged in correctly, or it is dirty.
  • Remove the temperature sensor, clean the plug with a cloth, reconnect.
Temperature Sensor Plug is inside the circle
Visual Inspection
  • Power OFF your cooking device. Make sure your device is not hot.
  • Check all of the wire connections for visual damage. Check the fan, controller, and switch connections.
  • Check the controller for visual damage or water penetration. Water can damage your controller.
  • Check the fan for visual damage. Are there any cracks or damages in the fan or fan housing?
  • Check for debris in fan. You may need to remove the fan cover to remove any debris that has gotten into the fan. To remove the fan cover, remove the 4 screws in the corners of the fan shroud.
  • Check the switches for visual damage.
  • If any components have failed visual inspection, they should be replaced. Contact Masterbuilt Customer Service.
Wire connection is inside the circle
Remove 4 circled screws
Check the Wall Plug
  • Make sure the breaker or GFCI is not tripped. Make sure the unit is plugged into the wall.
  • If you are using an extension cord, make sure it is an outdoor grounding -type 3- wire cord, marked with the suffix "W" and with the statement, "Suitable for Use with Outdoor Appliances".

Wiring Diagram

Version 1 - No Markings

Your wire connectors have no stickers / tags / or colors. Please refer to this diagram
  1. The "black only" wire coming from the fan is connected to one of the "red only" wires coming from the body of the smoker.
  2. The "red and black" wire coming from the controller is connected to the other "red only" wire coming from the body of the smoker. This is part of the same wire that should also be connected to the fan.
  3. The "white only" wire coming from the controller is connected to the "red and black" wire coming from the body of the smoker.
Numbered areas correspond to list of connections

Version 2 - "A, B, C" Stickers/Tags

Your wires have tags or stickers labeled “A” “B” and “C”. Please refer to this diagram.
  1. The "white only" wire coming from the controller is connected to the "red and black" wire coming from the body of the smoker.
  2. The "red and black" wire coming from the controller is connected to the other "red only" wire coming from the body of the smoker. This is part of the same wire that should also be connected to the fan.
  3. The "black only" wire coming from the fan is connected to one of the "red only" wires coming from the body of the smoker.
Line drawing of wired unit with wires A, B, and C marked by arrows
Photo of control panel connected to fan with wires that have lettered tags

Version 3 - Colors

Your wire connectors are different colors. Please refer to this diagram.

Black Connector

The "black only" wire coming from the fan is connected to one of the "red only" wires coming from the body of the smoker.

Yellow Connector

The "red and black" wire coming from the controller is connected to the other "red only" wire coming from the body of the smoker. This is part of the same wire that should also be connected to the fan.

White Connector

The "white only" wire coming from the controller is connected to the "white only" wire coming from the body of the smoker.

Line drawing of wired unit with colored connectors marked by arrows
Photo showing black, yellow and white connectors
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