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Message: <blockquote data-quote="Channel Hopper" data-source="post: 1097894" data-attributes="member: 175144">Success, for the time being. So far no leaks, however the heating itself still doesn't come on.I've looked a bit closer and it appears the primary flow switch isn't rising enough to trip the microswitch when central heating is required, though it is fine when I want hot water (so I doubt it is the diaphragm underneath)I can fool the circuitry by closing the switch manually, just to get the radiators warm, but I'm still not sure why there is less pressure through the diverter on the heating command. Strangely enough, when there was a leak the central heating would come on without trouble, but not an ideal situation with pans collecting water on the worktop.</blockquote>