E9
Ariston
EEPROM / Memory Error on Main Control Board
Dehumidifier shows E9 and will not start; sometimes appears after a power surge
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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 or EEPROM data, Power surge damage to control board, Manufacturing defect in memory IC, Loose control board connectors
How to Fix / Troubleshooting
Safety: Disconnect from mains before opening the control compartment.
Steps to address E9:
- 1. Power reset: Unplug the unit for at least 15 minutes to allow capacitors to discharge. Reconnect and test. If E9 returns, continue.
- 2. Check for surge damage: Inspect the power cord and plug for burn marks. If the unit was connected during a lightning storm or power surge, internal damage is likely.
- 3. Access the main control board: Remove the top or rear cover to reach the PCB. Look for burnt components, bulging capacitors, or discoloration.
- 4. Reseat connectors: Unplug and replug all harnesses to the board to ensure good contact.
- 5. If visible damage exists or E9 persists: The main control board must be replaced. This involves transferring all connectors to the new board exactly as on the old one. Take photos before removal to avoid miswiring.
- 6. Surge protection: After repair, use a quality surge protector to reduce the risk of future EEPROM corruption.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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