How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manufactured and modular homes
What does an orange or yellow flame at gas furnace mean?
Friday, December 3, 2021
A natural gas flame should be blue, with maybe just a small streak of orange at the tip, which indicates proper combustion. Any other color means incomplete gas combustion; which can be due to insufficient air supply, dirt buildup, or even a cracked heat exhangler. An orange or yellow flame also increases the amount of carbon monoxide (CO) produced.
We recommend you take a peek at your gas burners, while they are operating, at the beginning of the each heating season. If you don’t like the color of the flame, or the flame pattern is irregular or wavering, like in the photo below, call a service tech for further evaluation. An even better idea is to have a service contract with a heating and air conditioning company that checks your complete system annually.
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To learn more about gas furnace systems, see these other blog posts:
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