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

    Jan 18, 2007, 05:10 PM
    Lennox G26 furnace fan turns on by itself!
    Hi there

    I have a Lennox G26 furnace and a week ago, the furnace fan would just turn on by itself (the thermostat would be off at the time) and start blowing cool air. I would then try turning the thermostat to heat or AC, but it would continue to blow cool air. And it wouldn't turn off! The only way to get it to reset was to turn the power switch at the furnace itself off and back on.

    Please help!

    Thanks for your time!
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member
    		  
    #2

    Jan 19, 2007, 09:42 PM
    Sounds like a bad upper limit switch. However, if it was bad, I would think the blower would come on again as soon as you turned the heat on. Try replacing the upper limit switch. If that doesn't fix the problem, you may need a new control board. $$$$$
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