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    Honeywell CM927 displays "Internal Error"

    Many thanks for your repies guys - much appreciated. I guess I was unlucky this time!!!!!!!
  2. P

    Honeywell CM927 displays "Internal Error"

    Thanks for your response Mick Yes - new batteries do not solve it. It had only been "installed" for a couple of weeks before it failed like this
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    Honeywell CM927 displays "Internal Error"

    Hi Everyone - newbie to the forum I have had a new (?) CM927 Wireless Thermostat (purchased on FleaBay) working OK for about two weeks. It now displays "internal Error" on the LoT display. It also displays a flashing spanner icon. It also shows the room temperature as minus 24 degrees! Most...
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