E5
Emerson Inverter or Power Supply Error (Inverter Models)

Microwave display shows E5 and the unit will not heat or start.

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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 inverter board, Loose inverter harness connection, Shorted magnetron drawing excessive current, Faulty control board power output

How to Fix / Troubleshooting

Safety warning: Inverter-based microwaves operate at high frequency and high voltage. Internal components are extremely dangerous. Do not probe the inverter or magnetron while powered.

Basic user checks:

  • Power reset: Unplug the microwave for at least 10 minutes to allow internal capacitors to discharge. Plug back in and see if E5 clears.
  • Ventilation: Ensure vents are not blocked; overheating can trigger inverter protection.

Internal inspection (unplugged):

  • Remove the outer cabinet and visually inspect the inverter board (usually mounted at the base). Look for burnt components, cracked solder joints, or melted connectors.
  • Check that all harness connectors between the control board, inverter, and magnetron are fully seated and not discolored.

Professional service recommended: Testing and replacing the inverter or magnetron requires specialized tools and procedures. If E5 persists after a power reset and connector check, contact a qualified technician.

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Repair Difficulty

Professional Required 5/5

Required Part

Inverter Board
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