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Recent content by BlackRod

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    Programmer or valve not working?

    I fitted a new programmer (Honeywell 9400C) to my heating system last September. I thought everything was OK but now I find that the water won't heat up without the heating being on. Not a problem in the winter but will be now. So, what I have is: CH on and HW on - OK CH on and HW off - OK...
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