E09
AEG
Low-Voltage Power Supply or Control Board Fault
Microwave shows E09 and interior light does not come on; unit may not 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 low-voltage power supply on control PCB, Blown internal fuse, Shorted low-voltage regulator, Damaged control PCB tracks
How to Fix / Troubleshooting
Safety warning: Unplug the microwave and do not bypass any fuses. Internal fuses are safety-critical.
- Step 1 – Check mains outlet: Verify that the wall socket is live and correctly wired. Try another appliance to confirm.
- Step 2 – Inspect internal fuse: Remove the outer cover and locate the main ceramic fuse near the mains input. If blown, investigate for shorts before replacing. Replace only with the exact rating specified by AEG.
- Step 3 – Control board inspection: Examine the control PCB for burnt components, bulging capacitors, or cracked solder joints around the low-voltage section.
- Step 4 – Professional repair: Low-voltage power supply repair requires component-level work. If E09 persists after fuse replacement and visual checks, the control PCB should be replaced as a complete unit.
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Repair Difficulty
Professional Required
5/5
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