What routine check should be performed on a gas furnace during maintenance?

Inspecting and cleaning the ignition system is crucial during routine maintenance of a gas furnace because an efficient ignition system is essential for the proper functioning of the unit. Over time, dirt, dust, and other contaminants can accumulate on the ignition components. This buildup can lead to poor ignition performance, which might result in the furnace failing to start or operate efficiently.

A clean ignition system ensures that the gas burner lights promptly and reliably, helping to maintain safe operation. Regular inspection also allows for the detection of wear or potential malfunctions in components such as igniters or flame sensors, which can be addressed before they lead to more serious issues or system failures.

Maintaining the ignition system contributes to the overall efficiency of the furnace, helps prevent carbon monoxide production, and extends the life of the appliance. Thus, prioritizing this check is vital for safety, performance, and energy efficiency.