I have a honeywell central heating controller system (ST712 programmer). The controller shuts down if I attempt to have both the hot water and central heating running at the same time. The system works fine with either hot water or central heating on it own. I can switch between hot water and central heating using the controller switches. If I put both hot water and central heating on at the same time it runs for a while feeding both hot water and central heating after a short period the controller shuts down. I think the shutdown happens when the system is trying to change from feeding both hot water and central heating to just central heating. I know the acutator/valve is ok. Looking at the wiring diagram I think it could either be the controller or the cylinder termostat which is the problem, but am not sure which
Boiler is a potterton kingfisher mf. The system has worked for several years and this only started happening when I switched back from just using hotwater in the summer to combined hot water and central heating this Autumn,
DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!