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    nikki99cat's Avatar
    nikki99cat Posts: 1, Reputation: 1
    New Member
    		  
    #1

    May 18, 2008, 10:26 AM
    Furnace repair
    What would cause the round plastic sight hole to the furnace burners to melt around the edges.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    May 18, 2008, 10:30 AM
    Probably overheat.
    If not melted through just a bit of heat mark on the edges it could be normal with age.

    BUT it could also indicate improper combustion air control or needs a professional adjustment.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
    Ultra Member
    		  
    #3

    May 19, 2008, 07:34 AM
    2 much heat
    therinnaiguy's Avatar
    therinnaiguy Posts: 153, Reputation: 5
    Junior Member
    		  
    #4

    May 19, 2008, 07:55 AM
    Blocked flue vent, not enough combustion air, bad safety sensor, improper gas/air mixture, all of the above. Get a technician to inspect it.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #5

    May 19, 2008, 07:59 AM
    A natural gas furnace (NAT) operating on propane (LP) without the proper orfice conversion.
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