A residential gas heating system experiences extinction pop. Which of the following is generally NOT a cause of this problem?

When addressing a residential gas heating system that experiences extinction pop, it is important to identify contributing factors to this issue. Extinction pop generally happens when the flame in the burner extinguishes suddenly, leading to a backfire or a pop sound as the remaining gas ignites.

Poor valve cutoff can indeed cause extinction pop because it may allow too much gas to flow to the burner when the flame goes out, leading to a dangerous situation when the gas is suddenly ignited again.

A dirty burner can lead to insufficient air-fuel mixing, causing an improper flame that may go out. Similarly, insufficient combustion air can starve the flame, leading to problems with sustaining combustion and resulting in extinction pop if the flame extinguishes unexpectedly.

Incorrect gas type can create a variety of combustion issues, including flame instability. The system may not be designed to burn a different gas efficiently, leading to improper operation.

Considering these factors, poor valve cutoff is typically a recognized cause of extinction pop, whereas it is less indicative that it would generally be excluded as a cause in this context. The correct choice involves acknowledging that the others listed are more directly correlated with the issue at hand.