Display shows “Err 8” and valve will not enter manual regeneration when button is pressed

Safety: Unplug the softener before opening the control housing.

• Inspect keypad and overlay: Check for cracks, water damage, or delamination of the keypad overlay. If buttons feel stuck or unresponsive, the membrane may be damaged.
• Check ribbon cable: Remove the front cover and verify the ribbon cable between the display/keypad board and the main control board is fully seated and not pinched or corroded. Reseat the connector.
• Dry moisture: If condensation or water is present inside the control, dry thoroughly and correct any leaks above the unit. Moisture can short keypad contacts.
• Test button response: With power restored, attempt to navigate the menu and start a manual regeneration. If some or all buttons remain unresponsive, replace the Autotrol keypad/display board or the complete control module, depending on model.
• Seal and protect: Ensure the control cover gasket is intact to prevent future moisture intrusion.