Display shows “Err 10” and unit will not initiate regeneration at scheduled time

Safety first: No internal high-voltage work is required, but unplug the unit before removing the control panel.

Step-by-step checks:

• 1. Confirm time-of-day:
  • Check that the time-of-day is set correctly and that the regeneration time is programmed (usually 2:00 AM).
• 2. Check for power loss:
  • Look for blinking display or reset settings that indicate frequent power loss.
  • Ensure the outlet is not controlled by a wall switch or timer.
• 3. Manual regen test:
  • Start a manual regeneration. If it runs correctly, the mechanical parts are fine and the issue is with the clock/timer function.
• 4. Replace control board:
  • If the clock does not keep accurate time or Err 10 persists after reprogramming, replace the electronic control board.