The basic steps to light a gas fireplace pilot

To light your gas fireplace pilot, turn the control knob to the "Pilot" position, press and hold it down, and use a long lighter or match to ignite the gas at the pilot opening while you hold the knob. Keep the knob pressed for 30 to 60 seconds after the flame appears so the thermocouple — a heat-sensing device — can warm up and signal the gas valve to stay open. Once you release the knob, the pilot should stay lit. If it goes out, the thermocouple may be dirty or failing.

The exact location of your pilot opening depends on your fireplace model. Most are inside the firebox, near the bottom front or to the side of where the main burner sits. Some models have a small access door you may need to open first. Check your owner's manual for the precise location and any model-specific steps, since gas fireplaces vary widely in their design.

Key Takeaways

  • Turn the control knob to "Pilot," press it down, and light the pilot opening with a long lighter or match while holding the knob.
  • Hold the knob down for 30 to 60 seconds after ignition so the thermocouple can warm and keep the valve open.
  • If the pilot won't stay lit, the thermocouple may be dirty — try gently cleaning it with a soft brush or cloth.
  • If cleaning doesn't work or you smell gas, stop attempting to light it and contact a service technician.

Where to find the pilot opening on your fireplace

The pilot opening is usually a small brass or steel tube inside the firebox. Look near the bottom of the unit, often to the left or right of the main burner assembly. In some models, the pilot sits directly below the burner; in others, it's off to the side. The opening itself is typically the size of a pencil tip.

If you cannot locate it visually, check your owner's manual — it will have a diagram showing the exact spot. If you no longer have the manual, search online for your fireplace brand and model number. Many manufacturers post manuals on their websites for free read. The model number is usually on a label inside the firebox or on the back of the unit.

What to do if the pilot won't light

If you press the knob and hold it but the pilot won't ignite, the problem is usually a weak lighter, a blocked opening, or no gas reaching the pilot. First, try a different lighter or a long fireplace match — some lighters don't produce a strong enough flame. If that doesn't work, look closely at the pilot opening to see if it's clogged with dust or debris. A small piece of lint or ash can block the gas flow.

If the opening looks clear and you still can't light it, turn the knob to "Off" and wait five minutes before trying again. This clears any gas that may have accumulated. If the pilot still won't light after a second attempt, stop trying. The problem may be a gas supply issue, a faulty ignition system, or a valve that needs service. Contact a may have access to technician rather than continuing to attempt ignition.

Keeping the thermocouple clean so the pilot stays lit

The thermocouple is a thin metal rod that sits near the pilot flame. When it gets hot, it tells the gas valve to stay open. If the pilot lights but goes out as soon as you release the knob, the thermocouple is usually the culprit — either it's dirty or it's failing. Dirt and soot can prevent it from heating properly.

To clean it, turn the knob to "Off" and let the fireplace cool for at least 10 minutes. Then gently wipe the thermocouple with a soft, dry cloth or a soft brush. Do not use water or cleaning products. If cleaning doesn't fix the problem and the pilot still won't stay lit, the thermocouple may have reached the end of its life and needs replacement. A technician can swap it out — it's a straightforward repair that usually costs between $100 and $300 depending on your region and the fireplace model.

Safety steps before you start

Before lighting the pilot, make sure the area around the fireplace is clear of flammable materials — curtains, papers, furniture, and decorations should be at least three feet away. Open a window or door in the room to provide fresh air, since the pilot and main burner consume oxygen.

If you smell gas at any point — either before you start or while you're trying to light the pilot — do not attempt to light it. Turn the control knob to "OFF," leave the room, and call your gas company's emergency line or a licensed technician. A gas smell usually means a leak or a valve problem that needs professional attention. Do not use matches, lighters, or any ignition source if you smell gas.

When to call a technician instead of lighting it yourself

If you've tried the basic steps and the pilot still won't light or won't stay lit after cleaning the thermocouple, a technician should inspect the unit. The same applies if you smell gas, hear unusual sounds from the fireplace, see rust or corrosion around the burner, or notice the flame is an unusual color — yellow or orange instead of blue. These signs point to problems that go beyond a straightforward pilot light relighting.

A service call typically costs $75 to $150 for diagnosis, plus the cost of any parts or repairs needed. Many technicians offer annual maintenance visits that include cleaning, inspection, and minor adjustments — a good investment if you use your fireplace regularly. Ask your fireplace manufacturer or a local HVAC company for referrals to licensed technicians in your area.

Frequently Asked Questions

How long should I hold the knob down after the pilot lights?

Hold it for 30 to 60 seconds. This gives the thermocouple time to heat up and signal the gas valve to stay open. If you release it too soon, the pilot will go out. If you hold it longer, that's fine — just don't release it before 30 seconds have passed.

What if the pilot lights but goes out when I turn the knob to "On"?

This usually means the thermocouple is dirty or failing. Turn the knob back to "Pilot," let the fireplace cool, and gently clean the thermocouple with a soft cloth. Try lighting it again and holding the knob for the full 60 seconds. If it still goes out when you switch to "On," the thermocouple likely needs replacement.

Can I light the pilot without a long lighter?

A long lighter or fireplace match works best because it keeps your hand away from the flame. A regular match or lighter can work, but you risk burning your fingers. If you use a regular lighter, be very careful to keep your hand clear of the opening as the gas ignites.

Is it normal for the pilot to go out on its own?

No. A healthy pilot should stay lit continuously once the thermocouple is warm. If it goes out regularly, the thermocouple is probably dirty or worn out. Clean it first; if that doesn't solve it, have a technician check the gas pressure and the thermocouple itself.

What does the control knob do?

The knob controls the gas flow to the pilot and main burner. "Pilot" sends a small amount of gas to the pilot opening only. "On" opens the main burner. "Off" shuts off all gas. Some models have a "Ignition" setting instead of "Pilot" — check your manual to be sure which position to use.