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changing thermocoupling

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  • changing thermocoupling

    our gas fired HW cold start boiler has sat idle all summer. in attempting to start it in advance of the heating season, i noticed the pilot lite was out. attempted to lite same and the pilot won't stay lit. held the gas valve(honeywell R8200A) pilot lighting button for 3 mins and it still goes out. boiler has both gas and power. anyone know if the thermocouple threads where the thermocouple tube threads into the gas valve loosen counterclockwise or clockwise? info appreciated.
    there's a solution to every problem.....you just have to be willing to find it.

  • #2
    Re: changing thermocoupling

    Counterclockwise to loosen. Make sure the pilot is burning big enough to touch the thermocouple. The pilot orifice could be partially plugged causing a small flame. Your unit could also have some type of TCO. Are there 2 wires leading to spade terminals under the thermocouple connection at the valve? If you have a strong pilot flame, new thermocouple and the pilot still wont stay lit, then you need a new gas valve. That happens about 1% of the time.

    Andy

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    • #3
      Re: changing thermocoupling

      you also could check to see if the flame is enveloped in thermocouple bout 1/4 to 1/2 inch max..... was it windy from the chiminey? could cause the flame to blow out..... also check the tubeing going from the gas valve to the piolet to see if there is any crap ie lint, dirt in the tubing. other than that i agree to replace the valve, quickest and easiest way to solve the problem before to snow flies
      if u cant bedazzle em with briliance, baffle em with bulls&*t

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      • #4
        Re: changing thermocoupling

        Originally posted by FINER9998 View Post
        our gas fired HW cold start boiler has sat idle all summer. in attempting to start it in advance of the heating season, i noticed the pilot lite was out. attempted to lite same and the pilot won't stay lit. held the gas valve(honeywell R8200A) pilot lighting button for 3 mins and it still goes out. boiler has both gas and power. anyone know if the thermocouple threads where the thermocouple tube threads into the gas valve loosen counterclockwise or clockwise? info appreciated.
        could be a clogged pilot orfice. once you get the pilot assembly / thermocouple out check and see if air is passing through it. A wire brush / small drill bit will remove any excess carbon (from the gas) that would prevent steady gas flow.

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        • #5
          Re: changing thermocoupling

          got the pilot to lite after holding set button for 3 mins. initiated a call for heat and damper opened, like always, circulator started and when main valve tries to open, pilot went out. standing pilot is textbook re owners manual. full flame when lit and touching thermocouple as specified. getting new thermocouple today, if that doesn't fix it, we're off to a new gas valve.

          ruudacguy...what is TCO?
          there's a solution to every problem.....you just have to be willing to find it.

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          • #6
            Re: changing thermocoupling

            new thermocouple installed, boiler operating normally. burner chamber, burners and flue cleaned and ready for regular operation. now, if i can just find a way to afford natural gas!
            there's a solution to every problem.....you just have to be willing to find it.

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            • #7
              Re: changing thermocoupling

              Think of the cost of propane (estimated at around $0.72/litre so far), that should make the price of NG seem much better

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