Why Won't My Furnace Pilot Light Stay Lit?: 1 Minute to Understanding Common Solutions

If your furnace pilot light won’t stay lit, you’re dealing with a common home heating problem that can be caused by multiple factors. The pilot light is a small flame that ignites the furnace burners, and when it fails to stay lit, it often indicates an issue with the furnace’s safety components or its fuel supply. The three most common reasons are a faulty thermocouple, clogged pilot orifice, or issues with the gas supply. The thermocouple is a sensor that detects the pilot flame and allows gas to flow; if it’s bent, dirty, or malfunctioning, it will shut off the gas as a safety precaution. In other cases, the pilot orifice may be blocked by dust or soot, preventing the flame from burning steadily. Sometimes, disruptions in the gas supply – such as low pressure or a closed valve – can also prevent the pilot from staying lit.

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Tips 1:

Before calling a technician, try cleaning the pilot opening with a soft brush and ensure the thermocouple is properly positioned. Always turn off the gas supply before performing any maintenance.

FAQ

Q: What is a thermocouple, and how does it affect my furnace?

A: The thermocouple is a safety device that senses when the pilot light is lit. If it detects no flame, it shuts off the gas supply to prevent leaks.

Q: Can I replace the thermocouple myself?

A: Yes, replacing a thermocouple is a relatively simple DIY task. Be sure to follow manufacturer instructions or consult a professional if unsure.

Q: What causes a pilot light to go out repeatedly?

A: Common causes include a dirty pilot orifice, faulty thermocouple, or problems with the gas supply.

Q: Is a flickering pilot light dangerous?

A: It can be. Flickering may indicate erratic gas flow or airflow issues, which could lead to incomplete combustion and potential hazards.

Q: How often should I service my furnace?

A: Ideally, schedule annual maintenance before the heating season to keep components clean and functioning properly.