Sharp Thermal Overload / Overheating Shutdown

Microwave runs for a few seconds then shuts off completely, sometimes restarting after cooling.

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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

Blocked ventilation, Failed cooling fan motor, Dust buildup on cooling paths, Weak thermal cut-out intermittently opening

How to Fix / Troubleshooting

Safety: Unplug the microwave and allow it to cool before inspection.

Steps:

  • 1. Check ventilation: Ensure the microwave has the clearance specified in the Sharp manual. Move it away from walls or cabinets if necessary.
  • 2. Clean vents: Use a vacuum and soft brush to remove dust and grease from all external vents.
  • 3. Listen for fan: During operation, you should hear a steady fan noise. If the fan is not running, the unit may overheat quickly.

Advanced: A technician can test the cooling fan motor and thermal cut-outs on the magnetron and cavity. Replace any faulty fan or thermal device with Sharp parts.

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Repair Difficulty

Medium 3/5

Required Part

Cooling Fan Motor
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