The pilot light is a small flame that ignites your heating system, but if it keeps going out, your furnace or boiler can’t do its job. Here are the most common reasons this issue occurs and what you can do about them.

1. Faulty Thermocouple

The thermocouple is a safety device that detects whether the pilot light is on. If it’s dirty or damaged, it may cut off the gas supply.

  • Solution: Clean or replace the thermocouple. This is a relatively straightforward task for professionals.

2. Drafts

Even a small draft can blow out the pilot light, especially if the flame is already weak.

  • Solution: Inspect the area around your furnace for open vents, windows, or gaps that could let air in.

3. Dirty Pilot Orifice

The small opening where the pilot light burns can get clogged with dirt or debris, causing an unstable flame.

  • Solution: Turn off the gas and clean the orifice with a thin wire or needle.

4. Gas Supply Issues

If the gas supply is inconsistent or insufficient, the pilot light won’t stay lit.

  • Solution: Check your gas supply and make sure the gas valve is fully open. Contact your utility company if you suspect a broader issue.

5. Faulty Gas Regulator

The regulator controls the gas pressure. If it’s malfunctioning, the pilot light may flicker or extinguish.

  • Solution: A technician can test and replace the regulator if necessary.

6. Bad Flame Adjustment

The pilot flame needs to be strong enough to heat the thermocouple. A weak or yellow flame indicates a problem.

  • Solution: Adjust the flame size by turning the pilot light adjustment screw.

7. Overheating or Overuse

If the furnace overheats or is running too frequently, it may shut off the pilot light as a safety measure.

  • Solution: Check your thermostat settings and consider reducing the load on your system.

8. Damaged Gas Line

A leak or blockage in the gas line can disrupt the flow of gas to the pilot light.

  • Solution: If you suspect a gas line issue, call a licensed professional immediately.

9. Faulty Limit Switch

The limit switch is another safety feature that turns off the furnace if it overheats. If it’s malfunctioning, it could mistakenly extinguish the pilot light.

  • Solution: Have a professional inspect and replace the limit switch if needed.

10. Age and Wear

Older heating systems are more prone to pilot light issues due to worn-out components.

  • Solution: If your system is over 15-20 years old, it may be time to consider an upgrade.

Preventative Maintenance Tips

  • Regular Cleaning: Keep your pilot light and surrounding components clean to ensure proper functioning.
  • Annual Inspection: Schedule routine maintenance to catch potential issues early.
  • Seal Drafts: Prevent airflow disruptions around your furnace or boiler.

Addressing these issues promptly will help keep your pilot light steady, ensuring your home stays warm and comfortable through the winter months.