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Yeah I was afraid there may be such issues, i'm not near the system right now but I will have a look when I go there tonight. I will maybe include a picture if im not 100% sure on the setup. Thanks again, really appreciated Lee

So anybody have any ideas on rapairing the zone valve. i.e. do I need to replace the whole lot? Will I have to drain the system? And could there be anything in the current system design that would be stopping me from adding the extra zone valve to the HW, as I can't understand why this was...

Thanks for reply felix. Its just a 2 port valve, i.e. 1 input 1 output A > B. Its actually my parents house and they recon that its the same valve that was installed in 1981, and it certainly looks it. like I say its a normally closed spring return valve which opens when energised by the...

Hi there, My radiators on my central heating system have started to remain on all the time regardless of what the thermostat is set to. The system we have requires that the hot water is on for the central heating to work. I have checked the output from the thermostat with my...