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

    Feb 8, 2010, 04:58 AM
    GMT/GMTH (Goodman) Delayed start
    I am hearing several "thumping" noises in the ventilation when my GMT or GMTH is trying to start. The unit is roughly 6 years old and I have never had a problem with it until now.

    It thumps maybe 7-10 times then it kicks on and starts working.

    Thoughts?

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

    Feb 8, 2010, 06:14 AM
    Need EXACT model number
    tahnoak's Avatar
    tahnoak Posts: 2, Reputation: 1
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    #3

    Feb 8, 2010, 08:02 AM

    According to the faceplate the model # is: U36 Rev B
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Feb 8, 2010, 11:30 AM
    No cigar. Try looking behind the furnace door on the front of the furnace. In other words remove door and look for the furnace rate plate.
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