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Why does flame roll out of the burner chamber when gas to the burners is stopped?

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  • Cris Allen May 01, 2015

    Additional Comments as Requested to help analyse the problem with my natural gas, forced air furnas, Carrier Mdl 58GS100-2, series 203, is 25 or so years old. Burners are in good condition. However, as the burners are shut off you can hear and see the boom of combustion and the flash of flames from across the room. These flames roll out of the combustion chamber and up a few inches. Thank you for your help.

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  • Heating & Co... Master
  • 42,712 Answers

The fire is held clear of the jet by the fact that the gas is coming out too fast for the flame to burn back to the jet
when you turn the gas off then the flame burns back all of the residual gas
Best have it checked out by an accredited gas mechanic.

Posted on May 02, 2015

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Posted on Jan 02, 2017

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Buffalo12980
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SOURCE: Medallion Vermont Casting model CF9080

sounds like the regulator. there isn't much of anything left to go wrong! the gas comes out of a very small orifice in the burner tube and mixes with atmospheric air before being burned at the jet.

Posted on Feb 03, 2008

burzerko
  • 254 Answers

SOURCE: portable radiant convector heater -burner slightly faulty

you probably need to adjust the primary air mixture. There should be shutters on the front of the burner assy. If this does not correct the problem you may have dirty burners themselves. you could remove the burners and drag a wire brush across them to clean. but do not drills the openings unless you use a r&m bit

Posted on May 30, 2008

Therinnaiguy
  • 1420 Answers

SOURCE: Empire DV-35 low heat low flame

Check your gas pressure, You could have a gas valve problem or you could have a restriction in the air intake.

Posted on Sep 09, 2009

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SOURCE: Burners on our Brivis Buffalo 52 Ducted heater aren't getting gas

test thermosat for proper operation ie-broken wire-power if good jump stat and check if unit goes on if it does than stat internal problem or wiring problem and needs replacement or repair --if stat good check fan safety/high limit sensor if good would need to check and test thermocouple thats the tube that the pilot flame burns on may be enough to keep pilot burning but not enough to open valve for heat demand

Posted on May 31, 2010

SOURCE: Goodman down draft Gas furnace, red led flashes 6

Hello Try looking for a tiny TAN colored (button) near the front of the burner rack.It will have a wire in & out of it.In the middle there is a small tab/button.Push that in you will hear a click.That is the rollout switch.Check the vent/exaust pipe for blockage/draft to determine the cause of the switch tripping.The switch is a SAFTEY and repeated trips means there is a problem.

Posted on Sep 08, 2010

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1 Answer

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The gas jet directs the gas into a mixing chamber where it is mixed with the correct quantity of air before being emitted from the burner where it produces those nice blue flames. Sometimes, for a reason I don't know, ignition will cause the flame front to pass through the holes in the burner into the mixing chamber and the jet engine sound is heard. There will still be some flames from the burner but they will be weak and anaemic.

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