Siemens Voltage Drop or Internal Power Supply Weakness

Microwave clock and display reset or flicker when starting a cooking cycle.

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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

Weak household circuit, failing internal power supply on control board, loose mains connection, overloaded circuit shared with other appliances

How to Fix / Troubleshooting

Safety warning: Flickering displays can indicate unstable power. Avoid using the microwave on circuits with known issues.

Steps to try:

  • 1. Dedicated outlet: Plug the Siemens microwave directly into a dedicated wall outlet, not an extension cord or multi-plug adapter.
  • 2. Reduce load: Avoid running other heavy appliances (kettle, toaster, oven) on the same circuit while using the microwave.
  • 3. Test another outlet: If possible, test the microwave on a different circuit to see if the issue persists.
  • 4. Technician-level: If the problem occurs on a good circuit, the internal low-voltage power supply on the control PCB may be failing and require replacement.

Persistent flickering or resets warrant inspection to prevent further damage.

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Repair Difficulty

Medium 3/5

Required Part

Control PCB Power Supply Section
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