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    v-1grwil's Avatar
    v-1grwil Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Feb 15, 2008, 12:27 AM
    Gas burners fire then turn off, then repeat.
    When the furnace sits all night @ 68 and then in the am I turn up the thermostat to say 71. The burners start to fire and then shut right off, they run no more than 10 seconds. Then the blower comes on and the burners start firing again. Then they shut off again, its an on and off again cycle every 10-12 seconds for hours until the house heats up. I am trying to figure out if this could be caused by the thermostat.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Feb 15, 2008, 12:51 AM
    Start by cleaning the flame sensor with sand paper or replace the sensor.
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