E11
Aquabion
EEPROM / Configuration Data Corruption
Aquabion softener shows E11 and the display indicates an internal memory or configuration error.
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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
Power interruptions during programming, Electrical surges, Failing non-volatile memory on control board, Incorrect firmware version
How to Fix / Troubleshooting
Safety first: Unplug the unit before opening the controller housing.
- Perform a soft reset: Disconnect power for 5–10 minutes, then reconnect. Re-enter all programming parameters (time, hardness, capacity, regeneration schedule) according to the Aquabion manual.
- Factory reset: If E11 persists, perform a factory reset using the button sequence specified by Aquabion. Be prepared to reprogram all settings afterward.
- Check power quality: Use a surge protector on the Aquabion power supply to prevent future corruption from spikes.
- Replace control board: If configuration cannot be saved or E11 reappears after each power cycle, the main control board non-volatile memory is likely defective and the board should be replaced.
Warning: Incorrect programming can lead to insufficient regeneration and hard water. Record all original settings before performing a factory reset.
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Repair Difficulty
Medium
3/5
Required Part
Main Control Board
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