I'm going to add some more info in hopes of getting some kind of response. Our wall is completely open behind the shower and we put in brand everything. We took out all the old pipes behind the shower, soldered new ones to the new valve and soldered the whole thing to the existing hot and cold pipes. Once we had it all in and turned the water on, we couldn't get the valve to turn off. Water was coming out even when the valve was supposedly all the way off. We ended up calling in a plumber who said it was just stuck. Lovely!
Anyway, at that point, we were thrilled, thought we were good to go, and turned the water back on. It was on for a few hours with no problems at which point we heard this loud screeching and the water just started coming out of the tub spout. The valve was in the off position but water was coming out.
I called Kohler and they are going to send us a new mixing cap and pressure balancing unit. Has anyone else had similar problems? The more I read and hear about Kohler, the more it sounds like the outside parts look good, but otherwise can be a lot of trouble. If the parts they send don't work, we are going to have to start over from scratch. Any suggestions on whether we'll have more luck with another brand?
Also, would I have a better chance of getting a response if I post under the plumbing forum? Thanks!