E04
Beko Main Control Board Relay / Power Supply Fault

Beko oven shows E04 and will not start; sometimes appears after a power surge or when selecting a function.

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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

Failed relay on main PCB, Damaged low-voltage power supply on PCB, Burnt solder joints on relay terminals, Surge-damaged control board components

How to Fix / Troubleshooting

Safety first: Turn off power at the breaker and confirm no voltage is present before opening any panels.

Basic checks (user level):

  • Unplug or isolate the oven for 5–10 minutes to allow the control to fully discharge, then restore power and see if the error clears.
  • Check that the oven is on a stable power supply and that no extension leads are used.

Advanced checks (technician level):

  • Remove the control panel fascia to access the main PCB.
  • Inspect the board for burnt areas, cracked solder joints around the heater relays, or bulging capacitors.
  • If you see obvious damage, the board should be replaced; component-level repair is only for experienced electronics technicians.
  • Verify that line voltage is present at the board input and that the low-voltage (5V/12V) supply to the display and logic is stable.

Warning: The control board carries live mains voltage. If you are not trained in electrical repair, do not attempt PCB work; contact a qualified appliance technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Main Control Board (Oven PCB)
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