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

    Oct 11, 2012, 02:10 PM
    Troubleshooting
    Furnace does not start in heating mode. Tranformer is humming and the furnace makesa click and the led light shines solid and then flashes 3 times. We replaced the pressure switch and the same problem exists.
    drtom4444's Avatar
    drtom4444 Posts: 3,282, Reputation: 145
    Ultra Member
    		  
    #2

    Oct 12, 2012, 08:51 AM
    You need to check the fan switch and the fan motor. One is bad, most likely keeping the fan from running. The three flashes is the hi-limit tripping. This may help: https://dl.dropbox.com/u/8010163/How...e%20Manual.pdf
    You will need to get a meter and learn to use it. Just changing parts does not work, never has on modern units.
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