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

    Jan 4, 2010, 08:56 AM
    Carrier Fan won't shut off
    Having an issue that just started recently with our Carrier 58GP Series 100 furnace. At first it had the symptoms of a bad limit switch, furnace would turn off, blower off, then blower back on and off. I didn't replace the limit but am now having a different problem, the blower won't shut off (The flame will come on when it's supposed to).

    I'm attaching the electronic schematics:

    http://img51.imageshack.us/i/img1549p.jpg

    I've done some troubleshooting and am almost certain that it's not the limiter. I've disconnected Lim-1 wire and Lim-2 wires blower remains on (no voltage on GH).

    Just by looking at the schematics it seems to me the HFR or CFR relay is stuck on but I can't seem to get them to open.

    What steps should I take now? Should I just buy a new control board?

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

    Jan 4, 2010, 09:23 AM
    Your image file does not work at image shack.

    Disconnect the G wire on the furnace therminal strip and run it. Report back. If this fails it might be the board.
    jschen's Avatar
    jschen Posts: 3, Reputation: 1
    New Member
    		  
    #3

    Jan 4, 2010, 09:32 AM
    I've disconnected all the thermostat wires to no effect. Looks like I'm going to go get a new board at lunch.

    Good thing I posted the wrong link as it was the wrong photo anyway. =) Here's the right one.

    http://img683.imageshack.us/img683/4906/carrier.jpg
    jschen's Avatar
    jschen Posts: 3, Reputation: 1
    New Member
    		  
    #4

    Jan 4, 2010, 11:15 AM

    Changed out the controller, seems to have done the trick.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #5

    Jan 4, 2010, 11:19 AM
    Good deal. Glad you have heat
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