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This might get a little convoluted, but I will try to stay on point. MODEL: Rheem Fury 6yr 22V30F MANUFACTURE DATE: 31 May 2012

I replaced the Thermocouple, and made sure all connections were good, and secure, replaced the Gasket for the inner panel. This is a Natural Gas unit, and the wall furnace that is on the same line is working fine. Furnace is less than 8 feet of line from the Water Heater. Gas supply good. I can light the pilot, and it stays on. As long as I do not turn the unit to the "ON" position, the pilot will stay on. As soon as the unit goes to on, and the primary gas flow starts, it will all light for a few seconds, then it is like it burns itself out. Almost like there is too much gas pressure, but that should not be the case as it has been working like a champ since I moved in here. I am completely stumped!

  • When the main burner ignites it likely is starving the pilot flame too much, or the draft change is pulling the flame too far away from the thermocouple. The thermocouple must get direct flame, it doesn’t work from radiant heat. – Tyson Nov 1 '18 at 0:12
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Check the flue area from above the flame to the flue pipe, the flue pipe, and the chimney for any type of blockage or flow restriction such as a build up of dirt, rust, soot, or even a bird that may have gotten into the flue pipe or chimney.If you do not get rid of the burned gases the flame will go out slowly as the available oxygen is depleted. It is also possible to have a bad heater control, but I would check the flue first. The problem is probably not the thermocouple since a thermocouple will still produce voltage for some time after it's flame goes away.

  • I had the same problem once and it my case it was the control board, but you are right that he should check the airflow first to be sure that's not the issue. – Eric Petroelje Nov 1 '18 at 14:31
  • Okay, so I removed the flue completely. It is clear, all the way up. Found the intake grill on the side, used the compressor, and blew it out. Nothing really came out at all. Still the same issue, it lights for a few seconds, then like it burns out. The gas is NOT turning off, it is being starved for oxygen I think. – Shadoe Kat Nov 3 '18 at 16:54
  • Did you check the area between the burners and the furnace outlet for a blockage? Also, you may need to have a service tech check the burner's manifold pressure to make sure that the unit is not getting too much gas from say a bad gas pressure regulator – d.george Nov 4 '18 at 11:33

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