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    Jiffyjeff's Avatar
    Jiffyjeff Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jan 18, 2010, 06:24 PM
    Is it normal for furnace flame to go on and off during heating cycle?
    When my gas furnace goes on, the flame will be on for twenty seconds then turns off for about 5 seconds. The flame then reignites and repeats this cycle until the heat kicks off. The blower is running the whole time, just the flame turns off and on until temp. reaches desired thermostat temp. Is this off/on flame cycle normal??
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 18, 2010, 06:55 PM
    Not normal.

    If you have a flame sensor clean it.

    Make sure all registers are open

    Make sure nothing is blocking the return air openings

    Make sure the air filter is clean.
    frtwome's Avatar
    frtwome Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Jan 22, 2010, 09:22 AM

    Does your heater make a loud noise when the flames goes out? Mine is doing the same thing as your heater is. But when the flame goes out it makes a loud sound, like the flame spoofed out, loud air blowing sound.
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