What might indicate a faulty installation in a gas furnace?

A wavering flame in a gas furnace can indicate several issues related to a faulty installation or other operational problems. When the flame is unstable, it may signify that there is an improper air-to-gas ratio, which could be a result of poor installation practices such as incorrect venting or inadequate gas supply. A wavering flame can also suggest that the burner is not aligned properly or that there are blockages in the combustion area, leading to turbulence in the gas flow. This condition is concerning because it can result in incomplete combustion and increase the risk of producing harmful carbon monoxide.

In contrast, continuous cycling might suggest issues with the thermostat or a need for maintenance, while limited airflow typically points to problems such as dirty filters or duct obstructions rather than installation faults. Changes in flame color can indicate combustion efficiency problems but do not specifically reflect an installation issue as clearly as a wavering flame does. Thus, a wavering flame directly ties to installation errors that need immediate attention to ensure safe and efficient operation of the gas furnace.