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    Which programmer for CM927 RF roomstat?

    Thanks for the prompt reply. In the meantime I've had the following diagram sent from Honeywell technical support, the number 4 connection on the programmer is shown connected! Any comments? It also happens to be the way I have my system setup at present. Can I assume that if I leave it like...
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  4. N

    Which programmer for CM927 RF roomstat?

    Simond, I've just fitted a CM927 to my system that has an ST6400C programmer. Two questions I'd like to ask: 1 - If I keep the ST6400 how do I set the heating side? 2 - Or should I replace it with an ST9400C ? Thanks.
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