As the crisp October air settles over the Chicagoland area, many Illinois homeowners are finally switching their systems from cooling to heating. While you are likely checking your thermostat and swapping out air filters, there is one critical component of older gas furnaces that often goes overlooked until it stops working: the pilot light. At Summit Heating & Cooling, we believe that a well-informed homeowner is a safe homeowner. Understanding how your furnace ignites is the first step toward a worry-free winter. ### What is a Pilot Light? In many older gas furnaces, the pilot light is a small, constant flame that acts as the ignition source for your main burners. When your thermostat calls for heat, this flame ignites the gas flowing into the burners, providing the warmth your family needs. A healthy pilot light should burn with a sharp, steady blue flame. If you notice the flame is yellow, orange, or flickering erratically, it may indicate that the burner is dirty, the oxygen supply is restricted, or there is a potential for carbon monoxide production. ### The Importance of the Thermocouple If you have a furnace with a standing pilot, you likely have a component called a thermocouple. This small metal rod sits right next to the pilot flame. Its job is to act as a safety sensor; it detects the heat of the flame and tells the gas valve that it is safe to release gas to the main burners. If the pilot light goes out, the thermocouple cools down and automatically shuts off the gas supply to prevent a dangerous gas leak. If your pilot light refuses to stay lit, the thermocouple may be dirty, misaligned, or faulty. ### Safety First: When to Call a Professional While some homeowners may be tempted to relight a pilot light themselves, gas-related issues require caution. If you are uncomfortable or unsure about the process, it is always best to contact a professional. You should call Summit Heating & Cooling if: * The pilot light repeatedly goes out after you have attempted to relight it. * You smell gas near your furnace. * The flame is yellow or orange instead of blue. * You hear unusual noises like banging or rattling when the furnace attempts to start. * Your furnace uses an electronic ignition system rather than a standing pilot (these systems should never be serviced by anyone other than a trained technician). ### Modernizing Your Heating System If you find yourself frequently struggling with a finicky pilot light, it may be a sign that your furnace is reaching the end of its lifespan. Modern high-efficiency furnaces have moved away from standing pilot lights entirely, utilizing electronic ignition systems that are more reliable, safer, and significantly more energy-efficient. Upgrading to a newer model not only eliminates the stress of a pilot light going out on a freezing January night but also helps lower your monthly utility bills. ### Preparing for the Season The best way to avoid a mid-winter breakdown is through proactive care. Annual furnace inspections are the cornerstone of a reliable heating system. During a professional tune-up, our team at Summit Heating & Cooling cleans the pilot orifice, inspects the thermocouple, checks for gas leaks, and ensures your system is venting properly. By taking these steps now, you are setting your home up for a season of consistent, safe, and efficient warmth. Don't wait for the first deep freeze to discover an issue with your heating system. If you have concerns about your furnace’s ignition or simply want to ensure your home is ready for the Illinois winter, reach out to the experts at Summit Heating & Cooling today. Sources: U.S. Department of Energy