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    elahi101's Avatar
    elahi101 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Nov 17, 2009, 09:57 PM
    G40UHX Lenox gas furnace not working
    My LENOX gas furnace Model: G40UHX series does not work at all.

    I tried to start the furnace the main Blower kicks in.

    The Small blower does not run and Fire is not lit in ignite.

    The Air Condition Cooling unit is working.

    The Xformer has 27VAC output.

    Any body suggest what to chek and why?
    elahi101's Avatar
    elahi101 Posts: 2, Reputation: 1
    New Member
    		  
    #2

    Nov 17, 2009, 10:20 PM

    Also from Observation:

    The #2, #3 & #4 does not operate, what should Ilook for.

    when start set to call for heat it should be:

    1st ==within few second later the bigger/main blower should come on,blowing heat into the house
    2nd==the inducer motor comes on
    3rd ==after a few seconds the igniter should glow a pretty bright orange
    4th ==the gas valve open and burners fire up
    these steps are done in sequence 1-2-3rd-4th
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
    Ultra Member
    		  
    #3

    Nov 18, 2009, 11:11 AM
    Was the thermostat replaced since last heating season? If the circulating blower turns on first, the thermostat may not be configured for gas heating. Look on the back for a switch marked "E/F" or "E/G". If present, it should be set to "F" or "G".
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Nov 18, 2009, 04:25 PM
    Here is a complete service/parts manual for your unit. I suggest you keep a copy on your computer.

    http://0190acd.netsolhost.com/manuals/G40UH_Series.pdf
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