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  1. S

    Changing Motorised valve

    The 3 position motorised valve has packed up on my Sundial Y Plan system. I have purchased a new valve to replace the old one. Does anyone know whether I have to drain down the whole CH system to swap the valve? The valve is located next to the HW tank in the upstairs airing cupboard. There is...
  2. S

    CH comes on when only Hot Water selected

    I think this my problem may be related to a motorised valve which sits at the junction of the HW and CH circuits which is either stuck or needs replacing. Any suggestions as to how this can be fixed? Can I do this myself - I am not a plumber or CH engineer!! :(
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