How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
site-built, mobile/manufactured and modular homes
What color should the flame be in a natural gas furnace?
Wednesday, July 11, 2018
A natural gas flame should be blue, which indicates proper combustion. Long streaks of yellow or orange through the flame means the furnace needs adjustment and/or cleaning by a professional service technician. It could also mean you have a cracked heat exchanger. The burners shown below are an example of a furnace that needs service.
Colors other than blue indicate incomplete combustion of the gas due to insufficient air for combustion. This also increases the amount of carbon monoxide (CO) produced. We recommend you take a peek at the gas burners, while the system is operating, at the beginning of your heating season each year. 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 heating and air conditioning systems, see these other blog posts:
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