Siemens Power Supply / Control Board Failure

Oven display is dead (no lights), but mains supply to the unit is present

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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

Blown internal fuse on control board, Failed low-voltage power supply on PCB, Loose mains connector inside oven

How to Fix / Troubleshooting

Safety: Disconnect the oven from mains before opening any covers.

  • Check wall supply: Confirm voltage at the outlet or junction box feeding the oven.
  • Inspect terminal block: Remove the rear cover and verify that the mains wires are securely connected and not burnt.
  • Internal fuse: Some Siemens ovens have a small fuse on the control board. Access the board and check the fuse with a multimeter. Replace only with the same type and rating.
  • Board replacement: If the fuse is intact and there is still no display, the control board power supply is likely faulty and the board must be replaced.
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Repair Difficulty

Hard 4/5

Required Part

Main Control Module
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