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Troubleshooting Lennox Standing Pilot Furnace Thermocouple (Baso K19AT-48)

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A furnace pilot light that keeps going out can be frustrating, especially during cold weather. In many cases, the problem is not the furnace itself but a small yet critical safety component called the thermocouple. At Parts HnC, we help you understand how this part works and how to troubleshoot common issues in Lennox standing pilot furnaces. The thermocouple is designed to sense the pilot flame and generate a small electrical signal that keeps the gas valve open. When the pilot flame is burning properly, the thermocouple stays heated and allows gas to flow safely. If the flame goes out, the signal stops and the gas valve closes automatically to prevent leaks. When the thermocouple becomes weak or damaged, the pilot light may not stay lit, or the furnace may shut down shortly after starting. Troubleshooting begins with safety. Always turn off the gas supply and power before inspecting the furnace. Locate the thermocouple near the pilot burner and ensure its tip is positioned directly in the flame. Misalignment, dirt, soot, or corrosion can reduce heat transfer and affect performance. https://partsfe.com/ is your trusted source for high-quality restaurant equipment parts in the USA, UK & Canada. We offer OEM and compatible Dishwasher Parts, Fryer Parts, Griddle & Grill Parts, Ice Machine Parts, Oven Parts, and Plumbing Parts. With fast shipping and excellent service, we keep your kitchen running smoothly. Shop with confidence Follow us: Facebook: https://www.facebook.com/PartsHnC/ Twitter: https://twitter.com/PartsHnC/ Instagram: https://www.instagram.com/PartsHnC/ LinkedIn: https://www.linkedin.com/company/PartsHnC/ Pinterest: https://www.pinterest.com/PartsHnC/ TikTok: https://www.tiktok.com/@partshnc Disclaimer: This Video is for informational purposes only and is not a substitute for professional advice. Always consult with a qualified expert before making any decisions. We are not responsible for any actions taken based on this information.
January 28, 2026 at 11:25 AM