Grundig Power Interruption from Door or Loose Connection

Microwave clock and settings reset whenever the door is opened or closed.

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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

Loose mains connector inside unit, Faulty door switch causing brief power loss, Loose control PCB power connector, Failing line filter

How to Fix / Troubleshooting

Safety first: Unplug the microwave before inspection.

Step-by-step checks:

  • 1. Observe behavior: Note if the display flickers when gently wiggling the power cord or tapping the cabinet.
  • 2. Inspect mains connections: With the cabinet removed, check the power cord entry, line filter, and connectors to the control PCB. Tighten and reseat as needed.
  • 3. Check door switches: A shorting door switch can momentarily drop power. Test and replace any suspect switches.

If resets continue, the control PCB may have an internal fault and should be replaced.

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Repair Difficulty

Medium 3/5

Required Part

Line Filter Board
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