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I have a tankless boiler for heat in my home, and the pilot light will light but will not stay lit once i let of the pilot button to turn it on. the thermocoupling is new what else could it be?

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The thermocouple is not in the flame far enough. Be sure it is mounted in the flame. If there is a shield be sure it is not deflecting the flame away from the new tip. Hold the button a little longer. If that does not work you may need to return for a replacement. Make sure it is screwed in the valve straight. No tape or thread sealer.

Posted on Oct 10, 2010

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