Question about Honeywell Programmable Thermostat Heater

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Honeywell Chronotherm 3 thermonstat display is - HL. What does this mean and how do I fix it?

The display is only visable from a distance. Up close it looks blank.

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Posted on Jan 02, 2017

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SOURCE: Honeywell Chronotherm III Emer. Ht button keeps flashing

change the batts on the stat

Posted on Jul 07, 2008

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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

  • 252 Answers

SOURCE: I have an old Honeywell thermostat (Chronotherm

you are not geting AC power from the furnace

Posted on Sep 27, 2009

  • 252 Answers

SOURCE: Thermostat not functioning correctly

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

Posted on Oct 04, 2009

roniecon
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SOURCE: What does -AC mean on a Honeywell programmable

If it is just a heater,it means no power.

Posted on Nov 08, 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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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...

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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

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

I have a Honeywell Chronotherm IV Plus a/c unit and I can't get my air condt. to turn on. The room temp. says it's 17 degrees in the house so it won't turn on. I need to know how to reset the room tempt....


Not only are the Chronotherm IV's less than user friendly, they have a terrible failure rate. It sounds like one of the typical failures of the chronotherm IV. I suggest starting with a new thermostat.

Jun 12, 2008 | Honeywell Heating & Cooling

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