Hey folks, I have a Nest thermostat which I would like to use the hot water function. The problem I am having is that when I select hot water, the Honeywell valve won't open. It has never actually worked since the system was installed about 6 months ago. I just left the valve open, but now we are approaching the hotter weather, I would very much like the option to just heat the water on demand rather than the entire house. My electrician was out yesterday and did spot a dead cable in the Nest control box. He replaced this cable and tested all the other ones, so I don't think this is an electrical issue. I am leaning towards a DOA Honeywell valve. I was thinking of just buying a replacement motor to see if that worked as it seems an awful lot of hassle to get the whole valve replaced. I will likely have to get the entire system drained and pay a plumber to come out and fix it. Before I try a new motor, is there any default setting on the valve, or on the thermostat that I am overlooking? I am using a Warmflow unvented heating system. Thanks all!