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    Sam2727's Avatar
    Sam2727 Posts: 3, Reputation: 1
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    #1

    Jan 6, 2010, 08:25 PM
    Furnace model MTGMO75EGA3
    Hi: We have a Sears furnace model #NTGM075EGA3. It is from 1999. Every 15 minutes the burners shut off. The fan continues. We noticed the relay switch popped so we reset it and it runs for 15 minutes then shuts off again. Do you know what could be the problem?
    Sandi
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 7, 2010, 03:58 AM
    Here is a parts diagram of your furnace. Which part is it.

    ICP | Model #NTGM075EGA3 | GAS FURNACE | PAGE 1 | SearsPartsDirect.com
    Sam2727's Avatar
    Sam2727 Posts: 3, Reputation: 1
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    #3

    Jan 7, 2010, 05:44 AM
    Quote Originally Posted by hvac1000 View Post
    Here is a parts diagram of your furnace. Which part is it.

    ICP | Model #NTGM075EGA3 | GAS FURNACE | PAGE 1 | SearsPartsDirect.com
    It looks like it could be between number 17 or 18 part number Z
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #4

    Jan 7, 2010, 08:40 AM
    Could be a weak switch part number 18

    Or the exhaust might be partially restricted and I would check this first before replacing parts. Ice and snow or other items outside migh have it restricted.

    Gasket, limit switch is part number Z
    If you replace the limit switch make sure you get a new gasket
    Sam2727's Avatar
    Sam2727 Posts: 3, Reputation: 1
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    #5

    Jan 7, 2010, 09:11 AM

    I looked up the exhaust and didn't see anything - can I poke something in there to be sure?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #6

    Jan 7, 2010, 10:05 AM
    Usually the exhaust is disconnected for inspection but I guess you could poke around if you want.
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