Hisense
No Heat – High-Voltage System Failure
Microwave runs (light and fan on, turntable rotating) but food does not heat.
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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
Failed magnetron,Open high-voltage capacitor,Shorted high-voltage diode,Defective high-voltage transformer or inverter module
How to Fix / Troubleshooting
Critical safety warning: Do not attempt to open the microwave cabinet or touch internal components. The high-voltage system can retain lethal charge even when unplugged.
What you can do:
- Confirm the symptom: Place a cup of water in the oven and run on full power for 1–2 minutes. If the water remains cold, heating has failed.
- Check power level settings: Ensure the power level is set to 100% (or High) and not a low setting.
- Listen for unusual noises: A loud humming, buzzing, or popping sound can indicate a failing magnetron or high-voltage component.
Next steps:
- Stop using the microwave and contact a qualified technician.
- The technician will test the magnetron, high-voltage capacitor, diode, and transformer/inverter and replace the defective part.
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Repair Difficulty
Professional Required
5/5
Required Part
Magnetron Assembly
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