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Thanks Guys. Yes that identified the problem, in that as soon as the flow switch was disconnected the CH pump did it's thing radiators were hot in seconds. In my OP I stupidly said that there was no power supplied to the flow switch. but that should have been power is constant to the switch...

Hello all, my first post so please go easy on me... I have a Firebird Combi 90 boiler, installed about 7 years ago. Poor me... Ok the latest issues are that that the central heating pump will not work, and the DHW (Domestic Hot Water?) pump will not STOP working!. The hot water works just...