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    home70084's Avatar
    home70084 Posts: 5, Reputation: 1
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    #1

    Dec 13, 2008, 07:58 AM
    Why is central (gas) heat is blowing cool air
    When central unit is turned on it blows hot air. Once it reaches it set temperature, cuts off and comes back on it blows cool air? What could be the problem?
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
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    #2

    Dec 13, 2008, 08:21 AM

    Is the fan switch at the thermostat set to the "AUTO" position?
    home70084's Avatar
    home70084 Posts: 5, Reputation: 1
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    #3

    Dec 13, 2008, 08:23 AM
    Yes
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
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    #4

    Dec 13, 2008, 08:27 AM

    How long is the furnace off after a heat cycle before the blower comes back on?
    home70084's Avatar
    home70084 Posts: 5, Reputation: 1
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    #5

    Dec 13, 2008, 08:30 AM

    About 3 to 5 minutes, but sometimes it will come right back on
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
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    #6

    Dec 13, 2008, 08:32 AM

    How old is the furnace? Do you by chance have a model number?
    home70084's Avatar
    home70084 Posts: 5, Reputation: 1
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    #7

    Dec 13, 2008, 08:41 AM

    Not sure how old the furnace is, and I don't have a model number. I purchased the home 2 years ago and the unit was serviced then.
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
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    #8

    Dec 13, 2008, 08:50 AM

    Is the brand listed on the furnace?
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
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    #9

    Dec 13, 2008, 08:51 AM
    Can you see if it has a standing pilot? How long does the fan run before it shuts off,or does it ever shut off?
    home70084's Avatar
    home70084 Posts: 5, Reputation: 1
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    #10

    Dec 13, 2008, 08:59 AM

    Away from home at the moment so don't know the brand but I canhear a clicking sound before the pilot is lite
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
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    #11

    Dec 13, 2008, 09:05 AM

    Well, I really need a little more info to go any further. Without knowing what type of furnace you have it is hard to know where to tell you to start. Most newer furnaces control the blower with a circuit board. Older furnaces used a fan/limit switch.
    mikey007's Avatar
    mikey007 Posts: 6, Reputation: 1
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    #12

    Nov 9, 2011, 06:56 PM
    That is a safety device to cool down the chamber as long as it cuts off within 3-5 minutes.
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