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

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Furnace will not come on but thermostat is showing information

My thermostat is showing 63 inside. I have it set for "heat" at 70. The furnace will not come on. I changed the batteries and the furnace came on for about 30 seconds, then turned off.

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  • ssunderwood Nov 16, 2008

    It is a honeywell. I do not know about the pilot light, spark or glow do I know? The fan will come on if I select fan. The A/C does come on if I turn the temp below the "inside" temperature.

  • Anonymous Nov 20, 2008

    The indusser moter would not work it was binding up, so I replaced it. Every thing worked fine. Today I came home and the flame would not work on the burners no gas would come out ( the pilot light was lit). That is were I'm at now.

  • holdridge414 Dec 14, 2008

    I have a Reclaimer 80 furnace.It has been wokring ok until yesterday.The blower motor is the only thing is running.I have no spark and the hot surface igniter is not glowing.I do hear a clicking sound.Can you tell me what can be the problem and if so,where can I buy what I need.Please help me.Thanks Ray!!

  • Walt Ehrhard
    Walt Ehrhard May 11, 2010

    What brand furnace do you have? Do you have a pilot light, spark, or glow ignition system? Will your fan come on if you select fan? Will your A/C come on if you select cool?


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Turn off power to furnace and open the front panel and see if you can see burners and gas valve and Hot surface ignitor.
If you can. turn furnace on and watch to see if the ignitor glows.
Let me know what you find. If it doesn't glow you probably have a faulty Hot surface ignitor.
If I had make and model number I should be able to find the part

Posted on Nov 28, 2008

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Two stage heating is a method to make your home more comfortable while reducing your energy. Sound contradictory? Well, that's the truth. Two-stage furnaces are designed to operate like two separate furnaces, maintaining more consistent comfort levels throughout the home. Your furnace or air-conditioner maintenance group will be able to give you more information regarding their working, but I'll explain the basic facts.
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I have a goodman gmp 125-5 furnace. the furnace turns on, but will not stay on long enough to match the thermostat reading. for example, if i set my thermostat at 70 and the temperature inside the house...

Depending on what type of thermostat you have there are two possible adjustments there that may help you. Remove the cover from the t-stat and see if it has a mercury switch,It will be a small glass vial with a set of contact wires inside with a small amount of mercury inside. When the t-stat calls for heat the vial which is connected to a bi-metallic coil spring will move slightly which will close the electrical contacts with the mercury. Check to make sure that the t-stat is level because if it is not then the switch won't close when it should. If you need to adjust it there are screws that two are in a small slot which will allow you to move the t-stat a little to make it level. Once it's level tighten screws while holding it level.
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Starting this afternoon: Thermastat was set (Manual) to turn on at 68, display window showed 63 but the furnace was not running. I manually set the turn on temp below 63, then up to 67 and the systrm...

Definitely a thermostat.It has 2 sections.One is a temperature reference section(what temp you want).The other is the temp reading section.If either one is bad,it will do just like you said.Sounds like the reference section is probably bad because it comes on for a couple minutes then shuts down.Since it was fine earlier in the day,I doubt there is anything wrong with the furnace because as you can see,it is temperature related.A furnace problem would be more of no operation at all,even if just dirty or whatever.The thermostat also would be a more common 'fail component' than the board.A suggestion also,both for a car and a house.During the summer,run the heat for 2-3 minutes,just to cycle it occasionally.In winter,run the A/C for 2-3 minutes.Do both perhaps once or twice a month.It helps keep the components,somewhat fresh I guess you would say,because cycling it occasionally helps to keep it going good.Also,if you encounter a problem,you may be able to get it fixed before you really need it.In the meantime,feel free to come on down to FL until it's fixed,we have room,lol.Although it's chilly now,the weekend will be 70's.(sorry)Good luck,Greg

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Furnace shuts off at 63 no matter where i set the thermostat

check the selector switch on the thermostat and if you have gas, it should be on HG. If you have electric, it should be on HE. If you have an amp meter(clamp on style), check the white wire for amperage with the heat on. What ever the reading(.7 for example) set the heat anticipator located on the subbase to that number. this is for efficiency and must be set to the proper setting or the heat will not cut in and out properly

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Have gas furnace and this winter,began having

The Thermostat Wizard is an interactive tool that will guide you through wiring and troubleshooting your thermostat, as well as programming it to the most comfortable settings for you and your family. Simply answer the questions from the Thermostat Wizard to correctly connect, troubleshoot and/or program your Honeywell Thermostat. You can even print the instructions and bring them right to the thermostat to help make things easier.
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However - the problem is probably not with your thermostat but with your furnace. It is most likely a dirty flame sensor - a maintenance issue. If you have not had your furnace serviced recently (more than 1 year) that is where you should start. Modern furnaces require regular maintenance.

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Feb 28, 2009 | Honeywell Electronic Programmable...

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Joss sounds like the anticipator setting on thermostat i would replace it with a digital it will be more actturat . The furnace has to go over temp setting to turn off

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My furnace wont start from the thermomstat.i have to push in start button on the panel to kick on.. i have my temp set at 70.. i changed the batteries on thermostat.. but every other day i have to go down...

I would say that the thermostat needs replaced! (this is the most common problem with the honeywell brand!
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Jan 13, 2009 | Honeywell Electronic Programmable...

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