Russell Hobbs Intermittent High Voltage or Thermal Protection Trip

Microwave intermittently stops heating during cooking, then resumes or restarts

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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

Overheating magnetron,Weak thermal cut-out on magnetron or cavity,Loose high-voltage connections,Failing high-voltage transformer

How to Fix / Troubleshooting

Safety first: Unplug the microwave before any internal inspection.

  • 1. Check ventilation: Ensure all vents are clear and that the microwave has adequate space around it. Overheating can cause thermal cut-outs to open intermittently.
  • 2. Avoid long continuous runs: If the unit stops after long high-power cycles, allow a few minutes of cooling between uses and see if the symptom improves.
  • 3. Listen for unusual noises: A buzzing or arcing sound before shutdown suggests HV issues. Stop using the microwave and seek service.
  • 4. Internal checks (advanced): A technician can inspect and test the thermal cut-outs, magnetron, and HV wiring for loose connections or heat damage, and replace weak thermostats.
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Repair Difficulty

Professional Required 5/5

Required Part

Magnetron Thermal Cut-Out
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