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    fcinque's Avatar
    fcinque Posts: 4, Reputation: 1
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    #1

    Apr 15, 2009, 06:51 AM
    Why is there no heat coming from my furnace?
    I have a Luxaire forced air furnace. Model # G8T11516UHC11A. When my thermostat calls for heat the system turns on. The blower is operating but the heating element never gets hot or ignites. I tried changing the filter thinking there was a sensor when a filter is clogged. That did not work. When you pull off both panels, on the bottom to the left of the filter hanging off the blower there is a circuit board and there is a blinking red light. Is that an indication that something is wrong?
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    #2

    Apr 15, 2009, 07:23 AM

    Yes what number is it flashing? The codes will go from 1 to 8. also does your furnace have plastic vent or metel. I have worked on luxairs for 15 yrs and wound love to help you. Also the info for the fault codes will be on the back of one of the furnace doors, or on the contol board its self. Odds are it is flashing 4 or 5
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    #3

    Apr 15, 2009, 07:44 AM
    Quote Originally Posted by Joshdta View Post
    yes what number is it flashing? the codes will go from 1 to 8. also does your furnace have plastic vent or metel. I have worked on luxairs for 15 yrs and wound love to help ya. Also the info for the fault codes will be on the back of one of the furnace doors, or on the contol board its self. odds are it is flashing 4 or 5
    There are no numbers, just a flashing LED. However on the back panel it indicates what may be the problem depending on how many times the LED is flashing. Mine is flashing 4 times and it states that High Aux. or Spiull Limit switch open.

    Now what?
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    #4

    Apr 15, 2009, 07:46 AM

    OK that is the high limit switch. Was your filter dirty when you changed it?
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    #5

    Apr 15, 2009, 07:47 AM
    This is what it looks like.


    http://www.hvacpartsoutlet.com/Produ...SLB1370902.JPG
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    #6

    Apr 15, 2009, 07:48 AM
    It should be on the upper left, or upper right of the furnace. Above the gas valve and burners.
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    #7

    Apr 15, 2009, 07:54 AM
    Quote Originally Posted by Joshdta View Post
    ok that is the high limit switch. was your filter dirty when you changed it?
    Yes. Very.
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    #8

    Apr 15, 2009, 07:59 AM

    This limit is supposed to reset its self. How ever if it gets to hot sometimes it will not. Turn the power off to your unit. Then take a screw driver and tap the switch between the two wires this will usually free the switch. Then turn your power back on and see if it is working correctly
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    #9

    Apr 15, 2009, 08:13 AM
    Quote Originally Posted by Joshdta View Post
    this limit is suposed to reset its self. how ever if it gets to hot sometimes it will not. turn the power off to your unit. then take a screw driver and tap the switch between the two wires this will usually free the switch. then turn your power back on and see if it is working correctly
    Now all I have to do is identify the switch. I have a service technician here and he says all the switches he can find are closed.
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    #10

    Apr 15, 2009, 08:17 AM

    If they are all closed reset the power and try the unit
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    #11

    Apr 15, 2009, 09:02 AM

    Did you get it running??
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