E9
Aquasana
Backup Power / Real-Time Clock Failure
Display shows E9 and time-of-day or settings will not hold after power loss
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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 backup capacitor or battery on control board, Control board RTC circuit fault, Repeated power interruptions, Incorrect wiring of Aquasana power adapter
How to Fix / Troubleshooting
Safety first: Unplug the power adapter before removing the control head cover.
Steps to troubleshoot E9 (backup/clock):
- 1. Confirm symptom: Note whether the time resets to 12:00 or default after each outage and E9 appears.
- 2. Check power adapter: Verify the Aquasana adapter is firmly plugged into a stable outlet and that the cord is not damaged.
- 3. Avoid switched outlets: Ensure the softener is not plugged into an outlet controlled by a wall switch or timer.
- 4. Reprogram and monitor: Set the correct time and settings, then unplug the unit for 1–2 minutes. If the time resets and E9 appears, the backup circuit is failing.
- 5. Replace control board: The backup capacitor/battery is typically not user-serviceable. Replace the electronic control board or complete control head assembly.
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Repair Difficulty
Medium
3/5
Required Part
Electronic Control Board
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