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 ignition...how 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

    hi,
    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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I turned my thermostat down this morning to 68 degrees. I came back about 2 hours later to increase the temp to 70 degrees but when I push the ^ arrow instead of showing the increase to 70 it just flashes...


Since it's within 2 degrees of your setting it could be one of two things. Most furnaces run longer (pass your setting) to maintain the setting you made. Which really not a problem. However, your thermostat may need calibrating. To test this theory, place a regular wall thermometer next to your furnace's thermostat and see if the two temps match when the furnace cuts on and then when it cuts off.
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If you're turning it down to 68, because no one will be at home during the day, just set it 2 degrees cooler than 68 degrees. You will then wind up with 68 degrees.

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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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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.
Go to: http://yourhome.honeywell.com/Consumer/Cultures/en-US/Support/Thermostat+Wizard/

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.


Please rate my answer!

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