Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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I have an old Honeywell thermostat (Chronotherm III). We have no air conditioning (furnace & air conditioning do not turn on) The thermostat display shows "-AC". What does that mean?

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You are not geting AC power from the furnace

Posted on Sep 27, 2009

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What does -AC on honeywell chronotherm III thermostat mean?


AC means "air conditioning." If the AC icon is showing on your thermostat it means that your air conditioning is activated and should come on when the temperature threshold you've set on the thermostat is reached.

For example, if you've set the temperature level to 78 degrees, when the house temperature goes above 78, usually by about two degrees, the air conditioner should cycle on to cool it back down to 78 degrees at which point it will then turn off.


This information should be in your air conditioning/heating system or thermostat owners manual. If you don't have the manual, you should contact your air conditioning dealer or your builder to secure a replacement. The manual is essential for proper operation and maintenance of your system.

May 14, 2014 | Heating & Cooling

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Chronotherm III...Replace Battery notification blinking...replaced twice with the appropriate batteries, turned the correct way. Cleaned off the battery terminals and still have replace battery...


Thermostat problem; Honeywell chronotherm lll ' Low Batt. indicator Keeps blinking after Batteries replace. I chk'd batt. with elect. volt ntr. Was told to pull batt. and change ends with them , letthem stay reversed for 5-10 sec. then put them back in right order,and replace thermostat. No success!
Anyone have any answers

Nov 12, 2009 | Honeywell Power Humidifier: Furnace...

1 Answer

I have a honeywell III chronotherm thermostat /It won't turn on the heat or the air conditioning when turned to those settings, but it sometimes will when turned to "auto". The batteries seem fine, no...


it sounds like it is time to repalce the stat, auto is set to allow the fan to run only when the heat or a/c is on, the switch for heat and cool will select either, and the temperature lever should allow contact for the bulbs to bring on the desired component. there are no replaceable parts on a thermostat, or I would try to walk you through replaceing them. good luck.. I prefer the honeywell vision pro or the white rodgers 9500 series stats

Jul 11, 2009 | Honeywell Programmable Thermostat Heater

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Replacing aging erratic honeywell chronotherm III


Hi, your replacement part can be purchased on amazon, take a look here: Amazon com honeywell chronotherm III thermostat. I hope this was helpful. Cheers

Nov 30, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

Replacing thermostat for central heat and air/ not humidifier


rh and rc should have a jumper between them.connect red to either.y=yellow g=green w=white and do not use the blue.your new stat will run on batteries.

May 26, 2008 | Honeywell Power Humidifier: Furnace...

1 Answer

Thermostat malfunction


You may want to shut the breaker off to your furnace or air handler, or if you have a packaged system turn it's breaker off. This will kill the low voltage to the stat possibly allowing it to reset. I would also try to reset it after you turn your breakers back on.

Dec 22, 2007 | Heating & Cooling

1 Answer

Honeywell Chronotherm III


Try this link:

http://yourhome.honeywell.com/yourhome/Applications/TechLit/TechLitSearchResults.aspx

It looks like there are a variety of model numbers for the Chronotherm III. Hopefully you can locate your model number.

Dec 17, 2007 | Honeywell Power Humidifier: Furnace...

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