Had this fitted about 3 months ago. I was told when "Red" appears I was to turn the Black handle the other way as 2 bottles on left were empty. I forgot and after a while I noticed that I was still getting hot water. Closed the valves on the bottles on the right, and am still getting hot water from 2 bottles on left that are supposed to be empty. Don't use much hot water but what is going on?
