EcoWater 3000 Overfills, NOT Venturi

JeepinCJ,
Remove the Brine Valve assembly (float assembly) completely from the brine well and hang it outside of the water softener (assuming it is the cabinet style 3000 series) and set it in a pail or container. Check to see if water constantly flows from the brine valve asm. while in the service cycle. If water leaks constantly from the assembly, then you have to rebuild the control valve (replace rubber seals and possibly the rotor & discs). If no water flows from the brine valve asm. Check to see if you have a slow leak from the resin tank. With the brine valve assembly still in the pail, bail some water from the brine tank to about an inch below the overflow level. If water rises to the overflow level again (may take a few minutes) , then you have a slow leak from the resin tank. If there are no obvious signs of an external leak (water dripping down from the top of the resin tank, then the leak is at the bottom and the tank will have to be replaced.

Hope this helps...

I have a similar problem with brine tank overflowing with my ERR3000 unit. Water is leaking externally from the top of the resin tank along the outside of the resin tank into the brine tank. After 24 hrs the brine tank will be full and start to overflow out the tank overflow hose. I traced the leak to the connection between the control valve and resin tank. Water is trickling down at the clamp retainers between the two half clamps that clamp the control valve and resin tank together.

What is the cause of the leak? O-ring seal worn out? There are three o-rings in there, should I replace them?

I replaced the three o-rings and problem solved. Bought the o-rings online without having to go to a local EcoWater dealer.

If still following, I think the o-rings I need to replace are the three around the top distributor. Are the ones you mentioned?