I have a Kenmore Deluxe Demand water softener (model 625.348591, 5 years old) that is leaking water into the brine tank when in service mode. The regeneration cycle appears to be working fine. But in service mode it looks like water is leaking from the main valve assembly into the tank. After a few days, the tank fills up and water leaks on the garage floor through the overflow drain.
The nozzle and venturi look okay. No clogging or dirt.
Is this a simple valve gasket problem or does it look like a more serious problem? Anybody have a similar problem like this?