E09 displayed and the softener skips scheduled regenerations or regenerates at random times.

Safety first: No plumbing work is required. Work with dry hands when accessing the control panel.

Step-by-step:

• 1. Verify time and day: Enter the time setting mode and confirm the current time and day of week are correct. Adjust as needed.
• 2. Check regeneration mode: Ensure the AquaHouse softener is set to the correct regeneration mode (time-clock, metered immediate, or metered delayed) per your installation requirements.
• 3. Power stability: Confirm the power adapter is firmly connected and not sharing an outlet with high-draw appliances that could cause voltage dips. Use a surge protector if necessary.
• 4. Factory reset: Perform a factory reset from the installer menu and reprogram all settings. This can clear corrupted scheduling data.
• 5. Monitor behavior: Over several days, verify that regenerations occur at the programmed time. If E09 recurs or timing remains erratic, the clock circuit on the AquaHouse PCB is likely defective.

In that case, replace the AquaHouse main control board.