Question about Honeywell Programmable Thermostat Heater

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Thermostat not functioning correctly

"-AC" shows up on the Honeywell Chronotherm 3 thermostat display. Heat not working. How do we get the thermostat working again?

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  • HANK MCNEIL May 11, 2010

    -AC means it's not getting any power from the furnace. (not a stat problem!)

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  • 252 Answers

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

Posted on Oct 04, 2009

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Display shows LLL


PDF]Chronotherm III 7 Day Programmable Thermostat - Honeywell

https://customer.honeywell.com/resources/techlit/.../69.../69-0352.pdf
O I" O 0. HEAT M10 COOL OF ow to operateyo. This Owner's Guide will show you how to get the most benefit from your new thermostat. Your new Honeywell ...

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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.

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I have a Honeywell Chronotherm III Thermostat and in instead of showing the temparature in the display it shows -AC. I've replaced the batteries, and tryied adjusting Temp up and down for cooling and...


It would appear to me that you have lost the 24 volt power supply to the thermostat. In referencing the manuals for this thermostat, available @ www.honeywell.com, I've found that when the thermostat is not connected to the wall plate (plate mounted on the wall, that the thermostat either snaps or screws into), it will display the -AC. This being said, either the thermostat is loose on the wall currently, or your 24 volt transformer has died. Hope this helps.

Dec 23, 2009 | Honeywell Power Humidifier: Furnace...

1 Answer

I HAVE A HONEYWELL CHRONOTHERM 3, THE DISPLAY SHOWS THE TIME & -AC. I THINK THE UNIT IS FIRED. PLEASE ADVISE.


you have no power to the thermostat check to see if the furnace switch is on or if the blower cover is on properly.

Oct 17, 2009 | Honeywell Power Humidifier: Furnace...

1 Answer

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.

May 11, 2009 | Honeywell Programmable Thermostat Heater

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