Question about Honeywell Programmable Thermostat Heater

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Honeywell t8400c 1008(2) led light not working when set on heat

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Posted on Jan 02, 2017

  • 1015 Answers

SOURCE: want to replace analog Honeywell thermostat with digital

Your system uses 24 volts and that thermostat should work. You should only have a two wire system and that should work using the RH and W connection on the thermostat. My personal opinion about that thermostat...I don't like it. It will timeout for 15 minutes after furnace does not fire up. I deal with this thermostat all the time because that is what they install in the new homes. I always have to pull it off the wall, remove the batteries and wait for it to completely drain power becuase it does not have a reset switch. Very irritating...Might be too complicated for your application.

Posted on Oct 17, 2009

pendletonhea
  • 144 Answers

SOURCE: My honeywell t8400c also went blank. I can not

it should take a battery and it has wires coming from the unit for power as well the stat splits open from the wall leaving some of it mounted on the wall the batteries are in the part that pulls off the wall and the wires are on the part that stays on the wall the power wire is red on r terminal

Posted on Sep 23, 2010

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1 Answer

The display on my thermostat T8400C 1024 isn't working. Everything else works but the heat and the flame is not igniting either. Please help.


Sounds like a manual limit needs to be reset (thermal disc). Generally the manual limits are around the exhaust - backdraft, or burner assembly - flame rollout.

Feb 15, 2014 | Honeywell Heating & Cooling

1 Answer

Changed honeywell T8400C 1024 to Hunter 44760, I have five wires white, red, yelliow, green, blue. Hunter Thermostat reads "NO A/C Power.


Hi,
On the t-stat and the furnace make sure the wires are hooked like this...

Red to R
White to W
Green to G
Yellow to Y
Blue to C

then it should work..

Thermostat Wiring and Terminal Designations

heatman101

Jun 12, 2011 | Heating & Cooling

1 Answer

My honeywell t8400c also went blank. I can not find a battery anywhere and if plugs into the wall to get electricity. Everything works but the digital read out. Any suggestions


it should take a battery and it has wires coming from the unit for power as well the stat splits open from the wall leaving some of it mounted on the wall the batteries are in the part that pulls off the wall and the wires are on the part that stays on the wall the power wire is red on r terminal

Sep 23, 2010 | Honeywell Electronic Programmable...

1 Answer

I have a Honeywell T8400C 1024 thermostat. the last two nights, our heat continues to run without shutting off at the pre-set temperature. We have woken up to 81 degrees in our house. What is the...


Hello
Try taking the batteries out for 5 min,or disconnect power for 5min.
To clear it out.
Then re input all your times days and temps,

Is t stat in a cold location near a door or window?this could also override your settings,most progrmamble stats will go into override at 58.f im guessing this is not your problem.

If it continues after you reset,i would consider a new thermostat.

Hope this helps.

Jan 28, 2010 | Heating & Cooling

1 Answer

Honeywell T8400c thermostat went blank. central heating is not working although warm water is alright. any idea?


I would check the batteries in the thermostat. If the batteries are okay then you might have a blown fuse in the furnace or the furnace lost power check the breaker.

Jan 21, 2010 | Heating & Cooling

1 Answer

Want to replace analog Honeywell thermostat with digital


Your system uses 24 volts and that thermostat should work. You should only have a two wire system and that should work using the RH and W connection on the thermostat. My personal opinion about that thermostat...I don't like it. It will timeout for 15 minutes after furnace does not fire up. I deal with this thermostat all the time because that is what they install in the new homes. I always have to pull it off the wall, remove the batteries and wait for it to completely drain power becuase it does not have a reset switch. Very irritating...Might be too complicated for your application.

Oct 17, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell thermostat t8400c intermittent blank screen


It actually sounds like the batteries are going dead if the 24v from the furnace are not providing the power to the thermostat.

Sep 28, 2009 | Honeywell Electronic Programmable...

1 Answer

Honeywell thermostat T8400c started flashing, heat/cool was off. Display flashes all icons (heat and cooling icons, temperatures, everything) and on the oppposite flash, the setpoint is displayed. The fan...


Based on the simplicity of this particular t-stat, I really think that it is bad and needs to be replaced. They do not make this particular model anymore. I have included a link to the operators manual for the stat. Good luck!

http://customer.honeywell.com/techlit/pdf/PackedLit/69-1491.pdf

Apr 05, 2009 | Heating & Cooling

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