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Thermo couples

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GTD
GTD Member Posts: 31
in Gas Heating
I have a utica gas hot water boiler, model #M75AGB, serial # BB04404. What could cause the thermo couple to not work?  I had to replace it three times since december. Any help would be great. Tom

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  • Charlie from wmass
    Charlie from wmass Member Posts: 4,322
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    how large is the pilot?

    is this a standing pilot boiler or spark ignition?
    Cost is what you spend , value is what you get.

    cell # 413-841-6726
    https://heatinghelp.com/find-a-contractor/detail/charles-garrity-plumbing-and-heating
  • GTD
    GTD Member Posts: 31
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    thermo couples

    It is a standing pilot boiler>
  • Charlie from wmass
    Charlie from wmass Member Posts: 4,322
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    too large of a pilot flame

    or thermocouple too deep into the flame because something got bent can cause issues. are you sure it is the thermocouple that is the problem?
    Cost is what you spend , value is what you get.

    cell # 413-841-6726
    https://heatinghelp.com/find-a-contractor/detail/charles-garrity-plumbing-and-heating
  • GTD
    GTD Member Posts: 31
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    Thermo couples

    Yes because i try to clean it  will not light, i change it all is fine for a few months , then it will not light.
  • Techman
    Techman Member Posts: 2,144
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    Thermocouple

    I seriously doubt that you encountered that many bad t'couples.You need a Millivolt meter to test how much electricity( volts ) is being produced by the pilot flame.
  • GTD
    GTD Member Posts: 31
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    Thermo couples

    Thanks everyone for the help. Tom
  • Charlie from wmass
    Charlie from wmass Member Posts: 4,322
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    It is a thermo couple not

    a thermo pile, right?
    Cost is what you spend , value is what you get.

    cell # 413-841-6726
    https://heatinghelp.com/find-a-contractor/detail/charles-garrity-plumbing-and-heating
  • GTD
    GTD Member Posts: 31
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    Thermo couples

    It is a thermo couples.
  • Tim McElwain
    Tim McElwain Member Posts: 4,621
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    GTD do you have

    a multi-meter that will measure millivolts? If so then go up and click resources, then library and look for Tims closet there is a procedure for checking thermocouples there.
  • GTD
    GTD Member Posts: 31
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    Thermo couples

    Tim thank you for the info. Tom
  • Tim McElwain
    Tim McElwain Member Posts: 4,621
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    Tom, the

    Utica boiler has a tendency to burn up thermocouples especially when it is cold and the boiler is running a lot. There is a thermocouple from Johnson (now Baso Gas Controls LLC) it is the K16LRA nickel plated corrosion resistant and hi-temp thermocouple. It is a little more expensive but it will out last most T'couples 3 to 1.
  • GTD
    GTD Member Posts: 31
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    Thermo couples

    Tim ,  thank you.
  • Bob Harper
    Bob Harper Member Posts: 1,035
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    chimney?

    If the chimney is not venting properly, it can spill CO2, which displaces O2 causing pilots to snuff out. 

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