E9
Luxaire
EEPROM / Control Board Memory Error
Luxaire AC shows E9; system may not start or may shut down with no obvious mechanical issue.
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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
Corrupted firmware on control board, Power surge damage, Defective indoor or outdoor PCB
How to Fix / Troubleshooting
Safety: Turn off all power before touching control boards.
- Power reset: Turn off breakers to both indoor and outdoor units for at least 10 minutes. This can clear transient memory faults.
- Inspect board for damage: Remove the control panel cover and look for burnt components, swollen capacitors, or scorch marks on the Luxaire PCB.
- Check grounding: Ensure the system is properly grounded and that the ground wire is securely attached to the cabinet and service panel.
- Board replacement: If E9 persists, the control board likely needs replacement. Use the exact Luxaire part number and have a technician transfer any configuration jumpers and perform setup.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Control Board
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