A pilot light clogged with dust or debris will struggle to stay lit or won't ignite at all
The pilot light on a gas fireplace is a small flame that ignites the main burner when you turn on the fireplace. Over time, dust, lint, and debris collect around the pilot opening and the small tube that feeds it gas. When buildup blocks the opening or the gas line, the pilot either won't light or goes out shortly after you light it. Cleaning the pilot light assembly is a straightforward task you can do yourself in about 15 minutes, and it often solves the problem without calling a technician.
The process involves turning off the gas, letting the fireplace cool, locating the pilot assembly, and gently clearing away debris from the opening and the small tube. You will need only a few basic tools: a soft brush, a thin wire or straightened paperclip, and possibly a small vacuum with a brush attachment.
Key Takeaways
- Turn off the gas at the control knob and wait at least five minutes for the fireplace to cool before you touch any part of the pilot assembly.
- The pilot light sits at the base of the fireplace firebox, usually near the front left or right corner, and connects to a thin gas tube you can see running to the control valve.
- Use a soft brush or compressed air to clear dust from the pilot opening itself, and a thin wire to gently clear the small hole where gas enters the pilot tube.
- If the pilot still won't light after cleaning, or if you smell gas, stop and contact your fireplace installer or a may have access to technician rather than troubleshooting further.
Turn off the gas and let the fireplace cool completely
Before you touch anything, turn the control knob on the fireplace to the OFF position. If your fireplace has a wall switch, flip that to OFF as well. Wait at least five minutes — longer if the fireplace was running — so the pilot assembly cools down enough to handle safely.
If you have a remote control, set it aside; the control knob on the fireplace itself is what matters. Some fireplaces have a separate pilot control knob labeled PILOT, IGNITION, or similar. Leave that alone for now. You are only turning off the main gas supply to the unit.
Locate the pilot light assembly inside the firebox
Open the fireplace doors or glass panel if your model has one. Look at the base of the firebox — the interior chamber where the flames burn. The pilot light is a small opening, usually about the size of a match head, positioned near the front left or right corner of the firebox floor or lower wall. You will see a thin metal tube running from that opening back toward the control valve, which sits outside or to the side of the firebox.
The pilot opening itself may look like a small brass or steel nozzle. Around it, you may see dust, lint, or soot buildup. That buildup is what you are cleaning away. Take a moment to trace the gas tube from the pilot opening back to the control valve so you know which direction the gas flows — this helps you understand where blockages are most likely to form.
Clean the pilot opening with a soft brush
Use a soft brass brush, an old toothbrush, or a small paintbrush to gently brush away dust and debris from around the pilot opening. Work slowly and carefully; you are not scrubbing, just loosening and removing loose particles. Brush in the direction away from the opening so debris falls away rather than into it.
If you have a can of compressed air, a short burst aimed at the opening can also dislodge dust. Hold the can upright and use short pulses rather than a long spray, which can push debris deeper into the tube. If you use a vacuum with a brush attachment, hold it near the opening but do not press it directly against the pilot nozzle, as suction can sometimes pull debris into the tube rather than away from it.
Clear the pilot gas tube with a thin wire
The small hole where gas enters the pilot tube can become clogged with debris or mineral deposits. To clear it, straighten a paperclip or use a thin wire — a straightened piece of wire from a twist tie works well, or you can buy a small wire cleaning brush at a hardware store. The wire should be thin enough to fit inside the hole without forcing.
Gently insert the wire into the pilot opening, moving it in and out slowly a few times. Do not push hard or twist aggressively; you are clearing a blockage, not drilling. You may feel slight resistance as the wire moves through buildup. Once the wire moves freely, withdraw it and use the soft brush again to clear away any particles the wire loosened.
Test the pilot light after cleaning
Once you have cleaned the opening and the tube, close the fireplace doors or glass panel if you have one. Turn the control knob back to the PILOT position if your fireplace has a separate pilot knob, or follow the lighting instructions in your fireplace manual. Most fireplaces require you to hold the knob in the PILOT position while you press an ignition button or hold a lighter near the pilot opening.
The pilot should light and stay lit. If it does, turn the knob to ON and the main burner should ignite. If the pilot still will not light, or if it lights but goes out within a few seconds, the problem may be deeper than surface debris — possibly a faulty thermocouple, a gas line issue, or a control valve problem. At that point, contact your fireplace installer or a may have access to technician.
When to stop and call a professional
If you smell gas at any point during cleaning, stop when ready, close the fireplace, and open a window. Do not attempt further troubleshooting. Contact your installer or a licensed technician. A gas smell usually means a leak or a problem with the gas line, both of which require professional repair.
Similarly, if the pilot light still will not ignite after you have cleaned it, or if it lights but the main burner does not ignite, do not keep trying. Repeated attempts to light a fireplace that will not stay lit can waste gas and may indicate a problem with the ignition system, thermocouple, or control valve. These parts require professional diagnosis and replacement.
Frequently Asked Questions
How often should I clean the pilot light?
If your fireplace is used regularly and sits in a dusty room, clean the pilot light once a year or whenever it starts to struggle to light. If you use it occasionally and keep the area clean, you may only need to clean it every two to three years. If the pilot light goes out frequently, clean it first before assuming there is a deeper problem.
Can I use a toothpick to clear the pilot opening?
A wooden toothpick can work in a pinch, but it may splinter or break inside the opening. A straightened paperclip or a thin wire is safer because it is stiff enough to clear a blockage without breaking apart. If you do use a toothpick, be very gentle and remove it slowly so no pieces stay behind.
What if the pilot light is hard to see inside the firebox?
Use a flashlight or the light from your phone to look into the firebox. Angle the light so it shines on the base of the firebox where the pilot sits. If the opening is still hard to locate, check your fireplace manual — it usually includes a diagram showing the pilot location. Some manuals also show the exact position relative to the burner or the firebox corners.
Is it safe to clean the pilot light myself, or should I call a technician?
Cleaning the pilot light is safe if you turn off the gas first and let the fireplace cool. You are only removing dust and debris from the outside of the opening and the tube — you are not taking apart any components or working with the gas line itself. If you feel uncomfortable at any point, or if the pilot still will not work after cleaning, call a technician.
Why does my pilot light keep going out even after I clean it?
A pilot that goes out shortly after lighting usually means the thermocouple — a safety device that senses the pilot flame — is not working properly. Cleaning will not fix a faulty thermocouple. Other causes include a weak gas supply, a draft blowing out the pilot, or a problem with the control valve. A technician can test the thermocouple and diagnose the real cause.