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    rowe2's Avatar
    rowe2 Posts: 2, Reputation: 1
    New Member
     
    #1

    Jan 3, 2012, 07:39 PM
    Thermal Coupler
    If a thermal coupler is bad and the furnace is coming on loud upon the startup of the flame, can it also produce carbon dust buildup?
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
     
    #2

    Jan 3, 2012, 07:50 PM
    If a thermal couple is bad, the pilot will not stay lit, and the main burners will never come on. Your carbon buildup is caused by incomplete combustion, which can be cuased by many, many things.
    kel86's Avatar
    kel86 Posts: 2, Reputation: 1
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    #3

    May 18, 2012, 04:22 AM
    My thermal couple keeps getting carbon build up why?
    kel86's Avatar
    kel86 Posts: 2, Reputation: 1
    New Member
     
    #4

    May 18, 2012, 04:24 AM
    What can be the cause of carbon build up on a thermal couple
    Frank Mangrum's Avatar
    Frank Mangrum Posts: 86, Reputation: -3
    Junior Member
     
    #5

    May 19, 2012, 10:29 AM
    Quote Originally Posted by rowe2 View Post
    if a thermal coupler is bad and the furnace is coming on loud upon the startup of the flame, can it also produce carbon dust buildup?
    sounds like delayed ignition of burners and not a thermocouple problem. Either you have a weak pilot flame or burners need cleaning--gas pressures could be a factor

    . Yes carbonmonoxide could be discharged from furnace combustion area at the burners this should be looked at by hvac tech.
    Frank Mangrum's Avatar
    Frank Mangrum Posts: 86, Reputation: -3
    Junior Member
     
    #6

    May 19, 2012, 10:38 AM
    Quote Originally Posted by kel86 View Post
    What can be the cause of carbon build up on a thermal couple
    Your pilot burner needs cleaning or adjusting. Pilot flame should be blue. If flame is orange--white this is an indication that pilot needs attention. Poor pilot flame causes the build up of carbon products on the thermocoupling.
    Frank Mangrum's Avatar
    Frank Mangrum Posts: 86, Reputation: -3
    Junior Member
     
    #7

    May 19, 2012, 10:45 AM
    Quote Originally Posted by Frank Mangrum View Post
    sounds like delayed ignition of burners and not a thermocouple problem. Either you have a weak pilot flame or burners need cleaning--gas pressures could be a factor

    . Yes carbonmonoxide could be discharged from furnace combustion area at the burners this should be looked at by hvac tech.
    Your combustion chamber may also need cleaning as well as the secondary heat exchanger if carbon particals or soot is what you are seeing. The particles could be rust from inside of heat exchanger which were dislarged during burner misfire.

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