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    iceman1159's Avatar
    iceman1159 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jan 12, 2010, 12:47 PM
    Burner comes on and goes off before reaching temp, set on the thermostat
    My furnace model# is concord 90 High eff c2e24b-24, The thermostat call for heat the burner comes on for 15 sec and goes off. This happens 6 or 7 times and it shuts off.
    What should it do to correct it
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 12, 2010, 12:59 PM
    This is a stretch but try to clean the flame sensor. Fine sand paper or steel wool works well.
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