E4
East Oak Control Board Overvoltage/Undervoltage Protection

Control panel displays E4 and the smoker will not start heating; sometimes appears after a power surge or storm.

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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

Line voltage outside acceptable range, Power surge damaging control board, Loose power cord connection at control module, Internal power supply fault on main control board

How to Fix / Troubleshooting

Safety first: Unplug the smoker before inspecting the power connections.

Basic checks:

  • Verify outlet voltage: Use a multimeter to confirm the wall outlet is supplying approximately 120 VAC (North America) or 220–240 VAC (other regions), as specified on the smoker's rating label. Do not use the smoker if voltage is unstable.
  • Inspect power cord: Check the East Oak power cord for cuts, burns, or kinks. Ensure the plug blades are not loose or discolored. Replace the cord if damaged.
  • Check internal power connections: Remove the control panel or rear access panel. Verify that the power cord leads are firmly connected to the main control board and terminal block. Tighten any loose spade connectors.
  • Try a different outlet: Plug the smoker into a known-good, properly grounded outlet without an extension cord or power strip. Reset any GFCI or breaker that may have tripped.

If E4 persists: The internal low-voltage power supply on the main control board may be damaged. In that case, replace the main control board / control module. If you are not comfortable working with mains voltage, contact a qualified technician.

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Repair Difficulty

Hard 4/5

Required Part

Main Control Board
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