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Thermocouple Replacement

blah2u Member Posts: 1
newbie here. thanks in advance for your response. i'm trying to replace my thermocouple from my gas water heater. i've just taken the old, non-working one off which is 18inches. i already had a universal 36inch honeywell around the house. is there any harm by using one that is longer? also the new one has a piece that doesn't look required, but i cant get it off. does this matter either?


  • Steve Whitbeck
    Steve Whitbeck Member Posts: 669

    Is this water heater newer with the sealed combustion chamber?

    If it is then the problem is probably not the thermocouple.

    does the pilot lite and then go out after the burner is on for a while?

    If this is the case the flame arrester inside the bottom of your water heater needs to be cleaned out.

    You need to take the burner out and blow compressed air from the top down to blow the dirt out of the flame arrester.
  • Empire_2
    Empire_2 Member Posts: 2,343
    Something to ad:

    Ther HW t-couples are slightly shorter than others.  The silver screw on fitting generally does not need to be installed.  You will notice that it's way too big for installation.  Of corse,...Heed the post above.  The new tanks are totally different.

    Mike T.
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