Hi, I have a 2 zone system supplied by an oil fuelled boiler. The downstairs zone will only work if the upstairs or hot water systems are running. If I turn on the downstairs separately the boiler and pump come on for about 3 secs then shut down. If the water or upstairs are on the hot water is pumped through the whole system. Each zone has it's own motorised valve and these seem to be working. Help.
Thanks, the room stat seems OK as it switches the boiler on and off when the hot water is also on. I had ruled out the motorised valve as again the radiators warm up when the hot water is on also. Can they jam in a semi open state?
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!