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What does it mean when my thermostat says hold -ac

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It's a tempoary way to overide your programming, usually 2 hours.

Posted on Jul 09, 2009

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Does it have hold then a number?? hold means that you want to hold that temp

Posted on Jun 30, 2009

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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

1 Answer

My furnace has stopped working. the thermostat (Honeywell Chromotherm III) displays HOLD - AC. What does this mean? I replaced the batteries but nothing has changed.


Try to find a reset button or just change out the thermostat. I'm guessing you don't have the manual. Thats a pretty old model, I think you have to set the time and day before you can use the thermostat.

Dec 29, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Thermostat not functioning correctly


-AC means there is no power coming from the furnace. not a tstat problem

Sep 24, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Furnace tries to come on then .... hold -AC.


When the thermostat says AC it means there is no power to the thermostat.

Apr 16, 2009 | Honeywell Power Humidifier: Furnace...

2 Answers

-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,

Dec 12, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

Question


a programable thermastst has different modes. in auto it can deside whether to apply heat or cooling. ac air coditioning. or you are in ac mode, but should notice the ac unit comming on. if no ac unit then of corese it won't come on :)

Jan 15, 2008 | Honeywell Programmable Thermostat Heater

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