Why Won't My Pilot Light Stay Lit on My Furnace?: 1 Minute to Troubleshooting Your Pilot Light Issues

If your furnace’s pilot light won’t stay lit, it’s a common but frustrating issue that can leave your home uncomfortably cold. This problem is typically rooted in one of several causes: a faulty thermocouple, dirty pilot orifice, drafty conditions, or issues with the gas supply. The thermocouple, a safety device, senses when the pilot is burning. If it's malfunctioning, it cuts off the gas, extinguishing the flame. Accumulated dirt or debris can also block the pilot light's path, disrupting the flame. Drafts from nearby windows, doors, or vents can blow out a weak flame. Finally, if there’s an issue with the gas line or pressure, the pilot might not get enough fuel to stay on.

As a designer, I find that many older furnace setups lack optimized placement and integration with the overall room design, leading to practical problems like drafts or accessibility for cleaning. A thoughtfully integrated heating system should consider both function and form, ensuring easy access for maintenance, adequate ventilation, and aesthetic harmony with your living space. When evaluating changes, digital tools like a home designer application help visualize the impact of relocating furnaces or adjusting room layouts to reduce cold spots or drafts, often preventing ongoing pilot light issues.

Tips 1:

Schedule regular professional maintenance to clean the furnace’s components and inspect the thermocouple. If your unit is old or frequently causes problems, consult a pro about updating to a more modern, energy-efficient model—often these feature electronic ignition, removing the need for a pilot light altogether.

FAQ

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

A: The thermocouple is a sensor that detects heat from the pilot flame, allowing gas to flow only when it’s burning. If it’s dirty, misaligned, or faulty, it may need cleaning or replacement to keep your pilot lit.

Q: Can drafts really cause the pilot light to go out?

A: Yes, especially in older homes or near poorly-sealed windows and doors. Drafts can disrupt the small flame, causing it to extinguish.

Q: Is it safe to relight my pilot light myself?

A: If you know your furnace’s procedure and there’s no smell of gas, it’s usually safe. Always follow the manufacturer’s instructions and never force anything.

Q: How do I know if the gas supply is the problem?

A: If other gas appliances aren’t working or you notice weak flame, contact your utility provider; there may be a wider supply issue.

Q: When should I call a technician?

A: If repeated relighting fails, you smell gas, or you’re unsure about repairs, it’s best to call a certified service technician for safety and a lasting fix.