Question about Honeywell Focus 6300B 5-2 Days Programmable Thermostat Heater

3 Answers

I recentally relaced an old thermo, w/ a new rth2310b honeywell thermo, for some reason , during the first cycle of useing the heat...The furnace will run properly and heat the house to the correct temp and shutdown. Then when it kicks back on to maintain the correct temp, the gas flames kick on and off 3 times and the fan keeps running without any heat producing, just blowing cold air, not maintaing the temp? The thermo shows the flame indicator being on, however there is no flame on at the furnace, just the fan running?

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  • spaceghost77 Jan 25, 2009

    never had a problem before, I did however clean off the ceramic igniter alittle to try and see if its the igniter not the thermo? still waiting to see what happens. Aby suggestions, is this thermo compatible with a Trane Xe 78 ?

  • Pyldrvr May 11, 2010

    If the thermostat is digital make sure that if there are any switches that they are switched to the proper settings..such as gas or electric hp or non. Yours should be set to gas and non since you have a gas furnace. If you have all this set corectly you may just have a problem with the furnace itself. How old is the furnace and what brand.

  • Dale Koehn
    Dale Koehn May 11, 2010

    I hate to say this but you should never clean the Hot Surface Igniter, if it gets any kind of oil, cleaner or anything on it, you will have to replace it very soon as it will burn out, now are we talking about a thermocouple, or flame sensor ? now as far as your flame sensor, it might show that it is a green or yellow light on the board, but it still may not be letting the proper amount of voltage through to keep the burners lit, I would recommend that you remove the flame sensor and use a piece of emery cloth to clean it then reinstall, if it is a thermocouple, which I dont think it is you would need to replace it, now one other device in your furnace is called a pressure switch, it is a round sort of flat piece that has a small rubber tube running from it, and two wires, the pressure switch is normally located in the front of the service area of the furnace, remove the tube from the burner box or what ever it is attached too, you will have to probably do this a few time to get the timing down, **** on the tube, as you fire off the unit, you will hear a click when you apply suction to it, you will have to maintain suction through the sequence of operations, once the ignitor glows and the gas valve opens, you should see if the flames will continue to operate at that point, when you let off the pressure switch, the flames should go out, as the pressure switch is powering the gas valve, I would try this after trying the flame sensor trick, if you do have to go that far with the pressure switch, and after you have tryed that, and hooked it all back up, if it fails again, replace the pressure switch, I hope this clears up a little more about what to do and what to look at, let me know if you need anymore assistance, thanks,

  • Dale Koehn
    Dale Koehn May 11, 2010

    Were you having this same problem before you changed your stat ? or is this a whole new problem ?


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Hi sounds like the pressure switch is faluty try jumping out to see if it starts

Posted on Jan 28, 2010

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Dirty flame sensor

Posted on Aug 10, 2009

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Check your air switch mak sure its closed also check the high limit

Posted on Mar 13, 2009

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