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

    Jan 6, 2008, 08:11 PM
    This is weird
    Hi maybe someone can make a suggestion for me. I have a noma programmable thermostat and a lennox energy efficient furnace with central air. Twice now my furnace has stopped blowing hot air but continues to blow cold air. When I take off the air filter cover for about a minute and put it back on the funace stops blowing the cold air, ignites the burners and starts blowing hot air again. I had replaced the air filter before it last stopped working. Any suggestions would be appreciated, thanks Allanminor
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
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    #2

    Jan 7, 2008, 03:12 PM
    If that Lennox has a cam stat fan/limit control that is probably the problem just my best guess.
    therinnaiguy's Avatar
    therinnaiguy Posts: 153, Reputation: 5
    Junior Member
    		  
    #3

    Jan 8, 2008, 06:27 AM
    When it happens again, look on the circuit board through a small viewing port. You should see a blinking light. This is a diagnostic code that will stear you to the area of the issue. On the backside of the access panel, you will find a diagnostic code chart. I dought it's your filter, just every time you open up the furnace, you are reseting the control.
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