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  1. C

    Help with the Honeywell ST6400S

    Hi I also have the same problem it was installed by an electrician after my old one broke if anyone has the info my e-mail is ******* thanks
  2. C

    Help with the Honeywell ST6400S

    I wonder if anybody can help I to have the same problem and need to reset the service warning. System bought on ebay and not an installer so honeywell don't want to know any body send me the info. I hope somebody can. Thanks.
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