Which component is essential for the ignition process in a gas furnace?

The ignition system is the critical component responsible for initiating the combustion process in a gas furnace. This system consists of elements such as a spark igniter or a hot surface igniter that generates the necessary heat or spark to ignite the gas when the furnace calls for heat. The ignition system ensures that the gas is ignited safely and efficiently when the furnace operates, which is fundamental to the entire heating process.

Understanding the function of the ignition system is vital for anyone working with gas furnaces, as it directly impacts the furnace's performance, safety, and efficiency. If the ignition system malfunctions, the furnace will not ignite, leading to a lack of heat and potential safety hazards.