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Thanks all for your replies. A bit more information on what's installed: The controller is one of these: http://www.plumbworld.co.uk/invensys-lifestyle-111-2319# The actuator is one of these: http://www.plumbnation.co.uk/site/drayton-ma1-22mm-3-port-mid-position-motorised-valve/ The...

Hi, I have a strange problem with my central heating/water system, it has been this way since we moved into our current house. The problem is that the central heating and hot water cannot be on at the same time. In addition, the only way to get either to come on is to follow this bizarre...