Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater

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How to replace battery in Honeywell T8082A chronotherm thermostat/

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Posted on Jan 02, 2017

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  • 9 Answers

SOURCE: -AC appears in the display of chronotherm III

I have had the same problem- twice. It was a similar but different problem each time. The -AC means the ac control voltage isnt making it to the thermostat. In my case both times it was a switch in the control circuit that wasn't closing properly. The easiest was the front cover switch. If the front cover is removed from the furnace or has vibrated loose, the switch will open, preventing the furnace from running. The other instance I ran into was a flow switch on the exhaust blower which ensures the there is flow OUT the chimney. The switch wasn't functioning, so the furnace wouldn't start. The blower would come on for a short time, but the burners wouldn't light.

Hope this helps,

Posted on Dec 12, 2008

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  • 252 Answers

SOURCE: need help programing a honeywell thermostat T8095A1002

Go Here: http://yourhome.honeywell.com/Consumer/Cultures/en-US/Support/Thermostat+Wizard/

Posted on Apr 10, 2009

  • 19 Answers

SOURCE: My Honeywell chronotherm IV Plus thermostat intermittent problem

The Chrono Therm 3 and 4's were some of the worst products that honeywell has EVER put out. I would suggest switching to the Vision Pro 8000, please consult your local HVAC company for more information regarding the change over.

Posted on May 17, 2009

  • 252 Answers

SOURCE: I have an old Honeywell thermostat (Chronotherm

you are not geting AC power from the furnace

Posted on Sep 27, 2009

  • 587 Answers

SOURCE: how do I program my honeywell chronotherm IV Plus

Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.

Posted on Feb 28, 2010

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