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Sometimes, our furnace will start blowing cold air when it should be blowing hot...I know it is normal that it blows hot air and then will blow cool air as it cools to shut down. This is not what I am talking about. I am talking about while the furnace is blowing hot air to heat, it will quit blowing the hot air and start blowing cold and it it like the air conditioner kicks in. It will then continue running cold air...I usually have to shut the furnance off and when it kicks back on it will run awhile and then turn to cold air.....It does this off and on...sometimes it will run normally, other times it will start blowing the cold air??? Thank you.

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  • kimlt10 Mar 30, 2011

    Thanks. It does have a switch from heating to cooling, but this happens when it is in heating mode. It is winter here and the furnace is on heat and when it blows hot air, the furnace will start blowing cold air and continue blowing cold air, usually until I turn the furnace off and restart it. It is like it switches to air conditioning on its own. I am not sure if maybe something is starting to go out or why this happens.

  • grandpa_galb
    grandpa_galb Feb 22, 2013

    kimlt10, i have the very same thing go on, did you ever find out what was wrong ?

  • grandpa_galb
    grandpa_galb Feb 22, 2013

    Thanks. It does have a switch from heating to cooling, but this happens when it is in heating mode. It is winter here and the furnace is on heat and when it blows hot air, the furnace will start blowing cold air and continue blowing cold air, usually until I turn the furnace off and restart it. It is like it switches to air conditioning on its own. I am not sure if maybe something is starting to go out or why this happens.

  • grandpa_galb
    grandpa_galb Feb 22, 2013

    Thanks. It does have a switch from heating to cooling, but this happens when it is in heating mode. It is winter here and the furnace is on heat and when it blows hot air, the furnace will start blowing cold air and continue blowing cold air, usually until I turn the furnace off and restart it. It is like it switches to air conditioning on its own. I am not sure if maybe something is starting to go out or why this happens.

  • grandpa_galb
    grandpa_galb Feb 22, 2013

    sorry dont know it posted 2 times

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Do you have an automatic change over thermostat? this would switch it from heating to cooling.

Posted on Mar 20, 2011

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