Thermocouple going out on furnace

Discussion in 'HVAC Heating & Cooling' started by plumber69, Dec 10, 2019.

  1. plumber69

    plumber69 In the Trades

    Jun 20, 2014
    Prince Rupert, British Columbia
    Thermocouple is going out on furnace once or twice a day, I noticed the pilot assembly was covered in black soot. There was a small leak in the pilot tube connecting to the assembly. Fixed leak, could of this been shorting out the thermocouple if the leak caught flame
  2. WorthFlorida

    WorthFlorida The wife is still training me.

    Oct 28, 2009
    Orlando, Florida
    Probably caused a wrong air fuel mixture with a leak and the flame was not hot enough to keep the pilot thermocouple active.
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