Gas Heat ESCO Practice Exam 2026 – Comprehensive All-in-One Guide for Exam Success!

Question: 1 / 400

A technician observes the burner flames wavering in one corner shortly after starting up a 5-year-old natural gas furnace. What is the most likely cause?

A faulty heat exchanger

This is likely caused by a faulty heat exchanger that poses a potential safety hazard. A faulty heat exchanger can cause the flames to waver, as well as produce carbon monoxide. Improper gas pressure, dirty burners, and a clogged air filter can also cause issues with the flame, but they are not considered as likely as a faulty heat exchanger in a 5-year-old furnace. It is important to address this issue promptly to ensure the safety and efficiency of the furnace.

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Improper gas pressure

Dirty burners

Clogged air filter

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