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  1. #1
    Join Date
    Mar 2008
    Posts
    1
    Post Likes

    Unhappy Thermocouple Failure

    Does anyone know what causes thermocuples to fail? I have replaced 3 themocouples within 6 months on a standing pilot Weil McLain boiler. Any insight is appreciated.

    Doug

  2. #2
    Join Date
    Aug 2001
    Location
    Alberta, Canada
    Posts
    27
    Post Likes

    Thermocouple issues

    Cast Iron boiler burner compartments generate very high temps. In situations like yours, sometimes a stainless steel high heat resistant thermocouple may give you more longevity. Penn-Johnson make one, and are usually available at Heating Wholesale. Also check btu firing rate of boiler...make sure you' re not overfiring.

  3. #3
    Join Date
    May 2006
    Location
    Rochester, NY
    Posts
    22
    Post Likes
    If it's a continuing pilot outage problem...
    Are you sure the T-couple is at fault? Have you checked the DC millivolt reading before replacing the T-couples?

  4. #4
    Join Date
    Mar 2008
    Location
    albany, new york
    Posts
    20
    Post Likes

    Lightbulb thermocouple

    make sure no part of thermocouple is touching anything metal.

  5. #5
    Join Date
    Jan 2004
    Location
    PA
    Posts
    69,749
    Post Likes
    Improper set up.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  6. #6
    Join Date
    Nov 2001
    Location
    east kansas
    Posts
    8,050
    Post Likes
    Where in Alsaska are you?

    I was at Ft. Greely for a while. Spent a lot of weekends in Fairbanks.
    Beware of advice given by some guy on the Internet.

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