Gas Furnace Certification Practice Exam 2026 – All-in-One Guide to Master Your Certification!

A hot surface ignitor is an electrical component designed to ignite gas in a gas furnace. It works by using resistance to heat up a ceramic or silicon material until it becomes hot enough to ignite the gas that is being released into the combustion chamber. This method of ignition is more reliable and efficient compared to traditional pilot lights and is commonly found in modern gas furnaces.

Hot surface ignitors do not function as safety features, gas valves, or airflow regulators. Instead, they are specifically intended for the ignition process. Understanding how a hot surface ignitor operates is crucial for anyone working with gas furnaces, as it pertains directly to both the efficiency and safety of the heating system.