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Honeywell chronotherm IV Plus thermostat

I have a honeywell chronotherm IV thermostat. For some reason it seems to have stopped working sometime this afternoon. (the screen has gone blank)

I tried flipping the fuse box and it did not help. I am looking to see if there is perhaps a battery that I can replace but have not yet seemed to locate one. I don't believe it's the heating system in the house as the heat has been working properly without incident.

Do you have any suggestions?

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  • Anonymous Jun 03, 2008

    where are the batteries?

  • Anonymous Dec 11, 2008

     I have the same problem, blank screen.  Heating system is working fine.  I can find no batteries in the thermostat.  I wonder if there is a problem in the thermostat circuitry.

  • radcon9099 Jan 26, 2009

    Anyone ever solve this? I have the same problem

  • Anonymous Jan 31, 2009

    I have this same problem but this unit has no batteries. Any ideas would be great.

    Thx.

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There are no batteries on an 8600-8601-8602 series

Posted on Sep 19, 2008

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Sounds like batteries which is located under top cover.

Posted on Mar 04, 2008

Cant find batteries have modelT86002069

Posted on Jun 03, 2008

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