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    mikey2u's Avatar
    mikey2u Posts: 2, Reputation: 1
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    #1

    Dec 2, 2009, 07:19 PM
    Lennox furnace fan problems
    I have a lennox whiper furnace model c23-31-1 and when the furnace lights after a minute or so you can hear a click sound but the blower motor doesn't kick on. If I put the thermostat fan control to 'on' the fan will run constantly and the furnace will work but when the thermostat is set to 'auto' it does what I described at first. What is wrong with this?

    Mike
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Dec 2, 2009, 07:22 PM
    The fan and limit control OR the fan relay is defective when operating in the heat mode. Usually the heat exchanger heats up to a preset level then the blower turns on.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #3

    Dec 2, 2009, 09:40 PM
    Check this gadget, if present.
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    mikey2u's Avatar
    mikey2u Posts: 2, Reputation: 1
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    #4

    Dec 3, 2009, 07:46 PM
    It doesn't have that gadget.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #5

    Dec 3, 2009, 09:58 PM

    Sounds like the blower is managed by a circuit board, which may be malfunctioning.
    Benny01's Avatar
    Benny01 Posts: 3, Reputation: 1
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    #6

    Oct 8, 2012, 11:20 AM
    I have a Lennox Pulse furnace G14. Does anyone in this DIY world know where I can find parts for this unit anymore, specifically this fan/limit control? Any help would be great.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #7

    Oct 8, 2012, 05:45 PM
    If you are smart you will replace the Lennox Pulse. It is old but the main problem is it is a big troublemaker. If you decide to fix it you better find a old furnace man who has a boat load of experience with the Pulse furnace. If not adjusted properly they can go BOOM.
    Benny01's Avatar
    Benny01 Posts: 3, Reputation: 1
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    #8

    Oct 8, 2012, 08:18 PM
    Thanks HVAC
    Benny01's Avatar
    Benny01 Posts: 3, Reputation: 1
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    #9

    Oct 8, 2012, 08:20 PM
    Quote Originally Posted by Benny01 View Post
    Thanks HVAC
    Got any suggestion on a brand for a new one. 1600 sq ft house. Built about 1955
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #10

    Oct 8, 2012, 08:46 PM
    Most a newer furnaces are good where there problem comes to play is in the install. You can take a cheap furnace and make it purr like a kitten with the proper install but you can take the most expensive unit and turn it to junk with a bad install. Been saying this for over 45 years and it has always held true.
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