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Sorry me again just me again with update I got the new clock off eBay I know it was supposed to be new just tested continuity between 3 and 5 and got nothing. So tested the two wires for 3 and 5 and the boiler fired up so it is the clock at fault then can someone just confirm this before I go...

Hello everyone I have a ravenheat csi85 b (t) hot water works great but no central heating. No external thermostats or clock. But when I press internal clock (tm6192) red light comes on but nothing after that. Have change the clock still the same checked the diverter valve that's fine...