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    furnaceguru's Avatar
    furnaceguru Posts: 1, Reputation: 1
    New Member

    Jun 23, 2009, 05:20 AM
    Lennox G41 Series
    My Lennox Furnace G41 Series keep blowing the 3 amp fuse on the printed circuit board

    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert

    Jun 23, 2009, 06:49 AM
    Look for a short in the low voltage wiring or test/replace the board. You might look on the back side of the board for burn marks
    siberianair's Avatar
    siberianair Posts: 360, Reputation: -4
    Full Member

    Jun 23, 2009, 12:54 PM

    Does it short when ac comes on?
    Can you turn fan on and not short the fuse?
    Careful checking the board... fingerprints can damage the board if it is not already damaged.
    Also check the t stat wiring around the unit and make sure nothing has chewed through it or it is not showing copper anywhere.

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