Miele
Intermittent Overheating / Thermal Cut-out Cycling
Microwave intermittently stops heating during a cycle, then resumes or restarts after a pause.
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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
Marginal magnetron thermal cut-out, Partially blocked cooling vents, Weak cooling fan motor, Overheating control board area
How to Fix / Troubleshooting
Safety first: Unplug the unit before cleaning vents or accessing internal parts.
- Improve ventilation: Ensure the microwave has proper clearance on all sides and that cabinet vents are not blocked.
- Clean vents: Vacuum dust and grease from intake and exhaust grilles.
- Avoid long continuous runs: For heavy use, allow short cool-down periods between cycles.
- Check fan operation: Listen for the cooling fan. If it slows or stops intermittently, the fan motor may be failing and should be replaced.
- Thermal cut-out replacement (advanced): If the unit consistently shuts off at similar times, a weak thermal cut-out may be opening prematurely and should be replaced by a technician.
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Repair Difficulty
Hard
4/5
Required Part
Magnetron Thermal Cut-out / Cooling Fan Motor
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