Grundig Intermittent Door Interlock or Thermal Protection Trip

Microwave runs for a few seconds then stops and returns to the clock without heating the food.

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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 door switch bracket, Worn door latch hooks, Overheating magnetron causing thermal cut-out, Loose thermal cut-out connections

How to Fix / Troubleshooting

Safety first: Unplug the microwave before inspection.

Step-by-step checks:

  • 1. Observe door fit: Gently press on the door while running a short cycle (if safe to do so). If the unit runs longer when pressing, the door switches are misaligned.
  • 2. Inspect latch and hinges: Check for play in the door hinges and wear on the latch hooks. Replace worn parts.
  • 3. Check switch bracket: With the cabinet removed, ensure the door switch bracket is firmly attached and not bent.
  • 4. Inspect thermal cut-outs: Check that thermal cut-outs on the magnetron and cavity are firmly clipped and that their connectors are tight.

If the microwave still stops prematurely, a failing magnetron or control PCB may be at fault and should be diagnosed by a technician.

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Repair Difficulty

Hard 4/5

Required Part

Door Latch Assembly
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