Hi Jorge
when you say “ sending all the water down the drain “ is that a powerful flow or just a trickle? I have just spoken to a Paul at Wreakin Water and he is not certain what the problem is but suggested I try a new shuttle valve assembly and service kit for the idler gear. Quite a lot of money involved in that, £160. He did also say that in older machines the resin could expand and cause this problem. I was hoping that Jeremy Harris might be able to help, I don’t know if he still monitors this site.