E04 error and time-of-day clock resets or flashes, softener misses scheduled regenerations

Safety first: Always unplug the power adapter before inspecting wiring. Do not open the control board housing if you are not comfortable working around electronics.

Step-by-step:

• Check outlet: Plug a lamp or tester into the same outlet to confirm stable power. Avoid using switched or GFCI outlets that may trip.
• Inspect adapter: Verify the AquaUnique-branded power adapter is used. Check the cord for cuts, kinks, or burn marks. If warm or buzzing, replace it.
• Check connector: Remove the control head cover and confirm the low-voltage plug from the adapter is fully seated on the control board.
• Secure cable routing: Ensure the cable is not pinched by the cover or pulled tight, which can cause intermittent disconnection.
• Reset system: After confirming connections, plug the unit back in, reset the time and regeneration settings, and monitor for recurrence.

When to call a technician: If E04 persists with a known-good adapter and outlet, the control board may have an internal fault and should be replaced by a professional.