Question about Dayton Gas Furnace Heater

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Pilot wont stay lit installed new gas valve and new thermocouple

I could not get to stay lit

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  • rod crear Jan 28, 2009

    it is a stanading pilot also the fan blows across the burners i replaced thr gas vale ane the thermocouple . icouldnt see it clearly but it appeared to be getting a good flame iwll check it again tommorrow thanks

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Is this a standing pilot furnace, or electronic igniton?

If standing pilot, does the heater use a fan to blow air through the heat exchanger?

If the answer to those questions is yes, then check that the pilot orifice is not partially plugged and that there is a strong pilot blowing against the thermocouple. If there is, replace the thermocouple. If not, check the orifice again, and check that the inlet screen to the gas valve is not filled with gas line trash.

If the the pilot flame is good and it continues to go out, the thermocouple magnet in the gas valve may be weak. Replace the gas valve as to get just the magnet and coil is not easy.

Reply back any questions you may have.

Posted on Jan 28, 2009

  • Mark Egan Jan 28, 2009

    I bet your going to either find a poor pilot flame, clogged inlet to the gas valve, partially clogged pilot orifice, or poorly positioned and/or adjusted pilot flame.

    Some gas valves have a pilot adjust on them. For a standing pilot valve, the adjustment screw will be hidden under a cap or screw.


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SOURCE: pilot wont stay lit changed to new thermocouple

well if you have 6.2 psig at the valve that is your problem. most valves will only take an inlet pressure of 14" wc or about 1/2 psig. as pilot gas comes out of the valve with no regulation it would be blowing like a son of a gun. so if you have 6 .2" wc,water colum you are in good shape. have you tried to jumper the limit connections? a paper clip would work just fine. but if it does work no fair leaving it in place as a great danger may come your way. tell me what the pilot looks like blue and sharp or yellow and layz. there is a magnet in the valve that the thermocouple screws into but these dont often go bad.

Posted on Feb 11, 2011

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Posted on Jan 02, 2017

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