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    Padre01's Avatar
    Padre01 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 16, 2008, 08:52 PM
    Lennox Whisper Heat G20 - Need control board
    Model # g20-q314-100-1
    Serial # 5890A05729

    Need a control board for this furnace. The Q314 in the Model# may be Q3/4. The auto setting on the thermostat will not activate the blower fan. I had an HVAC guy come out and diagnose and this is what he told me. Is a Lennox part the only way to go? Can it be gotten from another source? Are there any used parts out there on the market? Brother can you spare a circuit board? I don't want to break anything but there is a limit sensor that someone suggested that I clean because it may get hot and limit out so no fan. Is this something that is pretty straightforward? The fan is running 24/7 at this point and the heat is staying a reasonable level but I want to get it back to normal function. I appreciate any and all help. Thanks.

    Frank
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
    Ultra Member
    		  
    #2

    Dec 16, 2008, 09:06 PM

    If memory serves me... what was I saying? Oh yeah, blower control is a timed function of the circuit board and starts when pilot is proven. Having said that, sounds like a bad board. Sorry. P.S. It's 3/4
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Dec 16, 2008, 09:12 PM
    Lennox board is the way to go. You could use a universal White Rodgers/Honeywell but you better pay a pro to change it over.
    MarkwithaK's Avatar
    MarkwithaK Posts: 955, Reputation: 107
    Senior Member
    		  
    #4

    Dec 16, 2008, 10:04 PM
    Quote Originally Posted by hvac1000 View Post
    Lennox board is the way to go.
    *sigh* Unfortunately.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
    Ultra Member
    		  
    #5

    Dec 16, 2008, 10:05 PM

    Wait a minute, maybe a paper clip...
    MarkwithaK's Avatar
    MarkwithaK Posts: 955, Reputation: 107
    Senior Member
    		  
    #6

    Dec 16, 2008, 10:07 PM

    I'm pretty sure paper clips were OEM on all Lennox.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
    Ultra Member
    		  
    #7

    Dec 16, 2008, 10:09 PM

    Yes, they proved to be more cost-effective than the previously-used diaper pins.
    hvac13b's Avatar
    hvac13b Posts: 1, Reputation: 1
    New Member
    		  
    #8

    Dec 29, 2012, 04:59 PM
    I am kind of having the same issue the unit fires up but the blower doesn't come on I have already changed out the blower ckt board but still no blower. I need help please... would the ignition modual make it turn the fan on.
    M/n-G20Q3E-75-1
    S/N-5891A00664
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