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Worcester Green Star, not heating rads.

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  • Worcester Green Star, not heating rads.

    Hi guys, my boiler (see image) works great on the hot water side and has for months and still is. The heating however, which incidentally hasn't been used since the end of the spring, isn't heating the rads.
    when I turn up the nest it kicks the boiler on but even though it sounds just like it always has, the radiators are cold and stay cold.
    The hot water is fine but when I do try the heating, the temp shoots up to paint stripper temps.

    Hope someone can help.