E7
Hisense High-Voltage Circuit Failure (Non-Inverter Models)

Microwave displays E7 and does not heat, though the interior light and fan may run.

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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

Open high-voltage capacitor,Shorted high-voltage diode,Failed high-voltage transformer,Defective magnetron

How to Fix / Troubleshooting

Critical safety warning: The high-voltage section of a microwave can store lethal charge. Do not attempt to access or test the high-voltage transformer, capacitor, diode, or magnetron unless you are a trained technician with proper tools and procedures.

What you can safely do:

  • Confirm symptom: Place a cup of water in the oven and run on full power for 1–2 minutes. If the light and fan run but the water remains cold and E7 appears, the high-voltage system is likely at fault.
  • Check for arcing: Look through the door during operation for visible sparks or popping sounds, especially near the waveguide cover. If you see arcing, stop using the microwave and unplug it.

Service recommendation:

  • Discontinue use and contact a qualified technician.
  • The technician will test the high-voltage capacitor, diode, transformer, and magnetron, replacing the failed component(s) according to Hisense specifications.
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Repair Difficulty

Professional Required 5/5

Required Part

High-Voltage Diode
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