Question about Honeywell Programmable Thermostat Heater

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Furnace blows cold air

The furnace turns on but the thermostat will not heat past 66 degrees and only blow cold air

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  • Chandler Ede
    Chandler Ede May 11, 2010

    Can you give us any make and model number of the heating system?

  • Robotinner May 11, 2010

    this may not be a Stat problem but let me ask if the filter is clean?

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Sometimes the fans kicks in by time ---or by heat...even if the heat cycles dont starts . Is this gas or electric,, name brand,.... model # ect...ect..

Posted on Dec 19, 2009

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Posted on Jan 02, 2017

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I have a carrier furnace and it seems to be only blowing out lukewarm or cold air and my house only gets up to 63 degrees


Make sure your filter is clean and that your heat registers are open and the cold air return is not blocked. So if you turn your thermostat up to 70 degrees is the burner shutting off before the house gets up to temp? If the thermostat has batteries are they new? Out side of that you may need a service tech.

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Why is my furnace blowing cold air?


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Honeywell thermostat blows cold air on heat


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Dec 19, 2013 | Heating & Cooling

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Unless we set the thermostat very high, like 80 degrees, the heater will blow cold air. When the heat does blow, it will eventually stop blowing heat and the fan will continue to blow cold air.


Check and make sure the filter is clean. This sounds like a restriction in the system. If the unit has central cooling make sure ther indoor evaporator coil is clean at the furance.The unit may be cycling the burners on and off at the high heat limit , fan/limit control. You can also eliminate the thermostst from the furance. Turn power off at the furnace and disconnect the wiring from the thermostat. Jumper the red and white wire together. Turn the furnace back on. The furance should run in the heating mode. Try this and see if the problem is still there.

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The furnace is blowing warm air even if the thermostat low.


The only thing that tells the unit to come on and off is the thermostat so I would definatly say it is it. When you turn the system back on, does the a/c run normally? If it does, then it's the problem with the heating side of the tstat. Also, does the fan come on when you put it to on and then turn of when you switch it back to auto? If it does, then the system is working fine, its the t-stat. Let me know if you have any more problems.

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1 Answer

Hot air blows unless the temp is turned down to 66 degress


well ? Does It get cold @ 66 Degrees? And If so.. Aint 66 degrees cold?

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