Err7
Masterbuilt
Low Voltage or Power Supply Fault
Display shows “Err7” and smoker will not start; sometimes accompanied by flickering display.
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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
Undersized or damaged extension cord, Loose power cord connection at control board, Internal power supply failure on control board, Household outlet voltage low or unstable
How to Fix / Troubleshooting
Safety first: Turn off and unplug the smoker before inspecting wiring.
- Check power source: Plug the smoker directly into a known-good grounded outlet without an extension cord. Avoid power strips.
- Inspect power cord: Examine the cord for cuts, kinks, or burn marks. Replace the cord if damaged.
- Verify internal connections: Remove the control housing and confirm the power cord connections to the control board are tight and not discolored from heat.
- Test outlet voltage: Use a multimeter to confirm the outlet provides proper voltage (typically ~120 VAC in North America). If low, consult an electrician.
- Replace control board: If supply voltage is correct and wiring is sound, the internal power supply on the control board may have failed and the board should be replaced.
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Repair Difficulty
Medium
3/5
Required Part
Main Control Board
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