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Viessmann Vitodens 100 Combi

Discussion in 'Plumbing and Central Heating' started by mallyplumbob, 12 Mar 2013.

  1. mallyplumbob

    mallyplumbob

    Joined:
    21 Feb 2008
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    Location:
    Derbyshire
    Country:
    United Kingdom
    Guys. Fitted Vitodens 100 six years ago. Last 2 days rads struggling to get hot. Boiler flow temp quickly up to 70 deg from cold and flow immediately off boiler same, but circulation to rads very slow. Am I right in thinking step motor cartridge (div valve) is stuck in mid position. Hot water ok when there is a demand. Removed cartridge today and it was sat midway !
    Any help appreciated.
     
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