Microwave displays E7 and will not start; sometimes appears after a power outage.

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.

Possible Causes

Corrupted control board firmware, Power surge damage, Failed memory IC on PCB, Loose connectors on control board

Safety: Unplug the microwave before any inspection.

Steps:

Power reset: Leave the unit unplugged for at least 15 minutes to allow capacitors on the control board to discharge. Plug back in and check if E7 clears.
Check power quality: Avoid using the microwave on circuits shared with large appliances that may cause surges. Use a properly grounded outlet.

If E7 persists, the main PCB is likely defective and must be replaced by a technician. Firmware or memory faults cannot be repaired at home.

Professional Required 5/5

Main PCB (Control Board)

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