A working pilot light is essential to keeping your boiler running efficiently and safely. It is the small flame that ignites the gas to heat water and keep your home warm. So, when it keeps going out, it’s not just an inconvenience it is a sign that something’s wrong. If your boiler pilot light won’t stay lit, North Country Aire will share what could be causing the issue and what steps you should take to fix it safely. North Country Aire explores this further below.

Check for a Draft or Airflow Issue

A strong draft is one of the most common reasons a pilot light goes out. If your boiler is located near a vent, window, or drafty area, the flame can be easily blown out. Try to identify and eliminate the source of the draft by closing nearby windows or redirecting airflow. If the pilot continues to go out even in calm conditions, there’s likely a deeper issue.

Inspect the Thermocouple

The thermocouple is a small but critical safety component that detects whether the pilot light is lit. If it senses no flame, it automatically shuts off the gas supply to prevent leaks. Over time, thermocouples can wear out, become bent, or coated in soot, which prevents them from working properly. Turn off the gas and allow the thermocouple to cool. Gently clean it with fine sandpaper or a soft cloth to remove soot buildup. If cleaning doesn’t solve the issue, the thermocouple may need to be replaced by a professional HVAC technician.

Clean the Pilot Orifice

Dust, dirt, and debris can accumulate inside the pilot orifice the tiny opening where gas exits to create the flame. When this passage is clogged, the pilot light won’t get enough gas to stay lit. Turn off the gas supply and allow the boiler to cool. Use a thin piece of wire or compressed air to gently clear out the orifice. Be careful not to damage the opening. If you’re not confident doing this, call an HVAC technician for proper cleaning.

Check for Gas Supply Issues

Sometimes the problem isn’t with the pilot or its components but with the gas supply itself. Low gas pressure, leaks, or a partially closed valve can prevent the pilot light from staying on. Ensure your gas valve is fully open and that other gas appliances in your home are functioning correctly. If multiple appliances are affected, contact your gas company immediately there could be an issue with your supply line.

Look for Moisture or Rust Around the Pilot Area

Excess moisture, corrosion, or rust around the pilot assembly can interfere with the flame or thermocouple’s ability to sense heat. This can cause the gas to shut off unexpectedly. Check for leaks, condensation, or rust damage near the pilot light. If you find moisture or corrosion, have a technician inspect the system it could point to a larger issue, such as a leaky heat exchanger or poor ventilation.

Faulty Gas Control Valve

If the gas control valve itself is malfunctioning, it might not properly regulate the flow of gas to the pilot light. This is less common but can cause persistent pilot outages. Gas control valves should only be inspected and replaced by licensed professionals. If you have ruled out other causes and the pilot still won’t stay on, call for service immediately.

Boiler & Furnace Heating Inspection, Troubleshooting, Diagnosis, Repair, Tune Up Maintenance & More in Mora, Cambridge, St. Francis, Oak Grove, North Branch & Greater Isanti, Minnesota

A pilot light that won’t stay lit isn’t just frustrating it is a warning sign that your boiler may need maintenance or repair. If your boiler’s pilot light keeps going out, contact North Country Aire and schedule our services today.