40278 Water Softener Full !!better!! -

If the water level is just a few inches high, that is normal.

The "40278" error on a water softener is more than just a code; it is a digital cry for help from a machine struggling with a salt bridge or a sensor malfunction. 40278 water softener full

If you’ve cleaned the venturi, cleared the drain line, and the tank still refills to the brim, the problem might be a or internal seal kit within the valve head. These require a more technical teardown and part replacement. If the water level is just a few inches high, that is normal