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@mandate checked the tank stat ..all working ok ,so all thats left is the 3 way port (iv already tryed a new room stat). Changed 3 way port and all working ok now ..Thanks for all your help... :D

@mandate Cheers i will try you suggestions ...although i have tryed a new room stat only a couple of days ago so i cant see it being that ..will let you know ..cheers

Iv not got a problem changing the 3 way port if thats what everbody thinks ...what i can't get my head around is the fact that if i turn up the tank stat it fires up and works fine!!

yes it is sunvic as i explained at the beginning of this post .

instructions say SDMV SERIES 3 PORT MOTORISED VALVES AND SDM1901 ACTUATORS..on valve itself just says sdm 1901

@chris r the cylinder stat is attatched ok and appeares to be working fine ..the room stat does not need a neutral(although there is one there ) at the moment the room stat says 20 degrees...the room stat is set on 22 degrees...i have a litle flame icon to say the heating is called...

Yes iv checked all conections...behind the timer , the thermostat and the connection box inside the airing cuboard ...nothing seams adrift and all teminals are tight

Can any one help (i hope so ) parts...ideal classic rs50 gas boiler, cadet(s) pump , sunvic select 207 programmer, sunvic tlx7501 digital room thermostat , sunvic clamp on tank thermostat, sunvic 3 port motorised valve . As far as im aware a normal pumped system with 2 water tanks in loft and a...