Recent content by Tunwells2

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    Honeywell CM927 displays "Internal Error"

    Thanks 'flip top'. Will give that a go too..
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    Honeywell CM927 displays "Internal Error"

    We have just had exactly the same problem, which started when we changed the batteries. Sounds like we need a new unit? Has anyone challenged Honeywell and got a free out of warranty replacement, it's obviously a known error?
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