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Domestic thermostat showing E 1 code for furnace and ac

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SOURCE: I have an old Honeywell thermostat (Chronotherm

you are not geting AC power from the furnace

Posted on Sep 27, 2009

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The display went blank on my honeywell t8600c thermostat. when the batteries were changed, the display shows the time and -AC. Nothing else functions


I believe this thermostat will display -ac if it loses power from the furnace or air handler. Your thermostat will operate on low voltage(same as your door bell) and constantly powers your thermostat. I would check your furnace breaker, and fuses to see if there is power to the equipment

Nov 03, 2013 | Heating & Cooling

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I have an American Standard Freedom-80 Two stage furnace/AC. After replacing my old Honeywell with a new Honeywell RTH2310 thermostat (which the guy from A-1 Heating & A/C assured me was compatible...


The DS1 probably means dip switch 1. The light is used to give you different trouble codes. There should be something printed on the circuit board or on a label nearby that lets you know what each series of blinks means. I agree a good place to start would be to recheck the wiring then make sure you have the program in the thermostat right. It has several options.

May 02, 2010 | Heating & Cooling

3 Answers

My totaline thermostat is blinking ''L6'' Furnace is operating ok, filter is clean. I can't figure out how to reset it and don't have a manuel.


Well..I just recently noticed this problem on mine and cant seem to find anyone to help me other than to call for furnace service..but the more i look into this ..the more i wonder if the code is L6 or Lb for low battery.

Jan 27, 2010 | Heating & Cooling

1 Answer

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

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

Having a problem with my AC/Furnace. AC was working fine and was turned on for about 3 weeks. Thursday night it cooled off and we opened up until Saturday morning. On Saturday morning the AC would not turn...


I think your problem is poor usage of the device,i.e. overloading the system. try running better cables to your furnace and ac. The reason i am lead to believe that is. If you already hired a pro to come and fix it for you,and he/she could'nt then what else could it be? in my experience ac units use electricity like microwave ovens.and power tools

Sep 12, 2009 | Heating & Cooling

3 Answers

Honeywell dial theromostat.


since you say it has a blank face it must be a digital thermostat. if the power is on to the furnace and the furnace door is on (door switch) and still does not give you a reading. You probably have a bad stat. if you are handy.... unhook the wires in the thermostat. jump the red and white wires together. the furnace should turn on. if it does the thermostat is bad. if it does not turn on its not the thermostat its the furnace

Oct 07, 2008 | Honeywell Programmable Thermostat Heater

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