You should be able to change the valve head yourself easily, no need to touch the pipework. most makes are held on by just two screws, head slips off, new one slips on. valves are a common cause of problems, y plan is a pain in the ass with problems sometimes though. S plan is simple. may well be just the micro switch. if it is then the pump should fire up with the roomstat clicking on but boiler not start. have a lok on the net for a honeywell Y plan circuit diagram, will help you understand how it works
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