Safety first: Disconnect mains power before opening the control housing.

Check power stability: Confirm the Nobel softener is plugged into a stable outlet, not a switched socket that may be turned off. Avoid sharing the outlet with high‑load devices that can cause voltage dips.
Inspect low‑voltage plug: If your model uses an external transformer, ensure the low‑voltage plug is fully inserted into the control head and not loose.
Backup battery: Some Nobel boards include a small coin‑cell or rechargeable battery for memory backup. If accessible, inspect for corrosion or leakage. Replace with the same type and orientation if it is removable.
Reset clock: After restoring power, set the correct time and regeneration schedule. Monitor for at least 24 hours to see if the time holds.

If E6 continues and the clock or settings keep resetting, the control board's RTC circuit is likely defective and the board should be replaced.

E6 displayed and the time or usage data resets randomly

Possible Causes