Display shows “Power Fail” or flashes after an outage; the time of day may be incorrect.

Safety: Low-voltage control work only; no plumbing changes required.

• Check outlet and transformer: Ensure the Culligan transformer is plugged into a live outlet and the low-voltage plug is firmly connected to the control.
• Reset time: Set the correct time of day and verify regeneration settings.
• Monitor for recurrence: If the message appears frequently without actual outages, the backup circuit on the board may be failing.