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will find out later, i do know the installer persoanlly and he installs these every day so he's in the dark with this one !!

thanks for the fast reply, the room stat has not been fitted as yet, the only programmer is on the boiler itself.

I have had the above boiler installed by a corgi reg engineer over the weekend, the boiler itself when first turned on would not fireup after the first 15 minute cycle, the hot water is fine and when the boost button is pressed all the radiators in the house turn on to red hot so that works...