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Message: <blockquote data-quote="Channel Hopper" data-source="post: 898330" data-attributes="member: 175144">The system used to start straight away after the heating was put on, and a varying number of minutes after a demand for hot water. Nowadays though ity could be up to an hour before the boiler kicks in.When it does start though the pump makes no out of the ordinary noises, and runs fine until the system is shut off.  The flow chart shows a check for 240v across X3 (pump connections ?), and when there is no start, there is no voltage.Will take the board out for a closer inspection tonight, though I ought to find where I left the solder first.</blockquote>