What component in a furnace is typically assessed when diagnosing lighting issues?

The ignition assembly is critical in the operation of a gas furnace because it is responsible for igniting the gas that is supplied to the burners. When diagnosing lighting issues, it's essential to assess this component to determine if it is functioning correctly. Problems such as a faulty igniter, dirty or blocked flame sensors, or improper alignment can prevent the ignition assembly from igniting the gas as intended.

If the ignition assembly does not create a spark or heat sufficiently to ignite the gas, the furnace will fail to light, leading to heating issues. Technicians often check the ignitor's continuity and condition as part of their troubleshooting process, making it a key focus when resolving lighting problems within the system.

Understanding the role of the ignition assembly is vital for effectively diagnosing and addressing issues in a gas furnace, thus ensuring safe and efficient operation.