Question about Honeywell Programmable Thermostat Heater

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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 recent manipulation of the thermostat, and the breaker aren't flipped

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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

Posted on Jul 14, 2009

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Posted on Jan 02, 2017

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1 Answer

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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Honeywell Chronotherm III Thermostat shows time of day-AC. No heat in the 2 zones with this message.


Hello,Message AC means that there is no 24volt power to the thermostat from the unit/s it controls.Please check all switches & curcit breakers to the unit/s as there is no low voltage power to the thremostat from the transformer in the unit/s.Maybe got turned off by mistake.

Nov 01, 2010 | Honeywell Electronic Programmable...

1 Answer

My honeywell chronotherm III says -AC any ideas


The problem is your 24v power source. I am unsure as to why you put "other than power source or batteries". If you did indeed check that your thermostat is receiving 24v, then I would say that you have a bad thermostat. Hope this helps

Jan 22, 2010 | Heating & Cooling

3 Answers

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

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.

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