E11 displayed and the unit will not accept new programming or settings.

Safety: Unplug the softener before opening the control housing.

Steps:

• Power cycle: Disconnect power for 5 minutes, then reconnect and test the buttons again.
• Inspect keypad: Check for physical damage, cracks, or signs of water intrusion on the AquaClean control panel.
• Check ribbon cable: Remove the control cover and verify the ribbon cable between the keypad and main board is fully seated and not pinched.
• Dry moisture: If condensation or moisture is present, gently dry the area with a soft cloth and allow the panel to air dry completely before reassembly.

If certain buttons remain unresponsive or E11 persists, replace the AquaClean user interface / keypad assembly.