Err8
Masterbuilt
Internal Control Calibration or Memory Fault
Display shows “Err8” and smoker will not maintain set temperature; may shut down unexpectedly.
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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
Corrupted control board memory, Firmware glitch after power surge, Control board overheating, Loose internal connectors on PCB
How to Fix / Troubleshooting
Safety first: Unplug the smoker before opening the control panel.
- Hard reset: Unplug the smoker for at least 10 minutes to fully discharge the control board, then plug back in and reprogram the time and temperature.
- Inspect control board: Remove the control panel cover and look for signs of overheating, cracked solder joints, or loose connectors.
- Improve ventilation: Ensure the control housing is not blocked and that heat from the cabinet is not directly venting onto the board.
- Re-test operation: Run the smoker empty at a moderate temperature and monitor for stability. If Err8 returns, the control board is likely defective.
- Replace control board: Install a new OEM control board matched to your Masterbuilt model if the fault persists.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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