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, so gently clean the tip if needed. After cleaning, relight the pilot and observe whether the issue is resolved.
If the problem persists, testing the thermocouple with a multimeter is recommended. A properly functioning thermocouple typically produces 20 to 30 millivolts when heated. Lower readings usually indicate failure and the need for replacement. Installing a compatible replacement thermocouple can restore reliable ignition and safe furnace operation.
For high-quality Lennox furnace parts and trusted replacements, visit PartsHnC and find the right solution for your heating system.
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