Recent content by mmigs

  1. M

    Updating Honeywell ST6100A to ST9400C

    Hi all, Hoping someone may be able to help. My old St6100A was looking a bit battered so I wanted to replace it. Naively bought the ST9400C because same brand, same back plate, thought I might just be able to replace the unit and not the back plate. Unplug one and plug in the other. My setup...
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