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cm921

  1. silverfox2019

    How do I set the two programmers on my CH+HW system

    The CH+HW system in my new home has a programmable room stat (a Honeywell CM921) downstairs and a 7 day programmer (a Honeywell ST6400c) upstairs in the airing cupboard housing the HW cylinder. I'm wondering how best to set the CH on periods for the times I choose. For example, is it best to...
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