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Thanks Chris - I think I'd assumed they were all S/H - but I see a few new ones are listed. Do I need to drain the system to replace, or is it just a case of removing the old white box, replacing with new and wiring up ?

Hi There, I have a Sunvic SD2701 3-port valve and I noticed recently that I am getting piping hot water even when only the central heating is on at the timer. I've seen several similar posts to this - so from what I've read it looks like the problem is with a sticking valve ? Dont think it's...