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have bought a 3 port valve to replace a faulty unit on my system, need to drain it, anyone who could please see this post with photos and see if you can help me Thanks //www.diynot.com/forums/plumbing/central-heating-problem-picshow-does-this-system-work.400157/ PHOTOS HERE...

Hi First post here have a problem with this system, I cant actually work out how it works as I have only had experience of Combi boilers. My problem is as follows, hot water all ok, the radiators stayed hot even with the thermostat (a basic Honeywell in the living room) set to 0 I...