Master the Heat: 2025 NATE Gas Heating Jam Session – Blaze Through Your Exam!

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What does it indicate if a gas furnace produces yellow flames?

The furnace is functioning normally

There may be an issue with combustion

The production of yellow flames in a gas furnace typically indicates that there may be an issue with the combustion process. In a properly functioning gas furnace, flames should be blue, which signifies complete combustion of the fuel. Yellow flames can suggest inadequate air supply, which could lead to incomplete combustion. This could result in the production of harmful byproducts like carbon monoxide, making it a safety concern. It can also signal potential issues such as a dirty burner, restricted airflow, or a malfunctioning gas valve that needs addressing to ensure safe and efficient operation of the furnace. Recognizing yellow flames as a warning sign is essential for maintaining the safety and efficiency of the heating system.

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The heat exchanger needs replacement

Airflow is unrestricted

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