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    dsmith292's Avatar
    dsmith292 Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Jan 30, 2010, 07:55 PM
    Trouble codes for york furnace
    I have a York furnace and the blower is not coming on. The diagnostic fault code light started with 4 blinking reds which describes it as the limit swith is open. Now diagnostic fault code light is blinking 11 times which describes it as limit switch open - blower failure. I had the furnace off most of the day cleaning out the Aprilaire humdifier. Would the wire coming off the humidifier have any impact on this limit swith being open? I bumped it while I was cleaning the area out and I checked it and it appeared to be all connected at the humidifier control unit. How do I get the limit switch/blower to work? We are getting pretty cold now since it is about 15 degrees outside right now.. thanks!
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 31, 2010, 08:13 AM
    Try turning the blower switch on the thermostat from auto to ON and see if the blower runs
    dsmith292's Avatar
    dsmith292 Posts: 3, Reputation: 1
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    #3

    Jan 31, 2010, 08:37 AM

    I tried that and it didn't work. I was going to buy a new thermostat since I have been wanting a programmable one anyway to see if by chance the thermostat is bad.
    dsmith292's Avatar
    dsmith292 Posts: 3, Reputation: 1
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    #4

    Jan 31, 2010, 08:40 AM
    I forgot to mention that I ran through the wiring diagram to what I believe is the limit switch which appears to be some sort of sensor that extends into the fire box. It has a Texas instruments label on the device.
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