Question about Honeywell Power Humidifier: Furnace Humidifier/ Humidifier

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I have a Honeywell Chronotherm III and am not getting any heat.

The display reads HOLD - AC
I can't get it to change and turn on the furnace.
Suggestions?

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  • John O
    John O Nov 30, 2013

    The owner's manual indicates that some models will display the - AC message when operating on the backup batteries. I would check to see that there is 24-volt power to the thermostat.

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  • 308 Answers

Replace your thermostat

Posted on Jun 18, 2009

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