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

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Chronotherm iii set pt message

Set pt message on display what is this

Posted by Anonymous on

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Posted on Jan 02, 2017

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  • 9 Answers

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

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SOURCE: Honeywell Chronotherm III puts heat up contrary to programming

sounds like t-stat is going bad

Posted on Jan 06, 2009

  • 252 Answers

SOURCE: I have an old Honeywell thermostat (Chronotherm

you are not geting AC power from the furnace

Posted on Sep 27, 2009

roniecon
  • 6826 Answers

SOURCE: What does -AC mean on a Honeywell programmable

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

Posted on Nov 08, 2009

  • 185 Answers

SOURCE: Honeywell Chronotherm III Lowest temperature

If you are successful in setting it lower , you will end up with frozen pipes and large plumbing bills. Since the internal walls of a building can be as much as 20 degrees lower, that the room.
And the location of the thermostat, may be even warmer, that that of the areas where the plumbing is.
Now what is your reason for wanting the thermostat operate at a lower temperature?

Posted on Jan 31, 2010

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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 ...

Sep 13, 2015 | Cars & Trucks

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

1 Answer

Display and buttons not working


replace t-stat if there is power to inside unit

Oct 22, 2009 | Honeywell Electronic Programmable...

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