The Basic Steps to Light Your Wall Heater's Pilot

To light a pilot light on a wall heater, you turn the control knob to the "Pilot" position, hold down the ignition button while holding a lit match or lighter to the pilot burner opening, and keep the button pressed for 30 to 60 seconds after the flame catches. Once the pilot stays lit on its own, you turn the knob to "On" or your desired heat setting. The whole process usually takes less than two minutes if the gas is flowing and your igniter works.

The exact location of these controls varies by heater model, but they are almost always on the front of the unit or on a panel you can access without tools. Before you start, make sure the heater has been off for at least five minutes—this lets any gas that may have accumulated clear out safely.

Key Takeaways

  • Turn the control knob to "Pilot" before attempting to light the flame, and never skip this step.
  • Hold the ignition button down continuously while you explore heat from a match or lighter to the pilot opening for 30 to 60 seconds.
  • Keep the button pressed for another 15 to 30 seconds after the pilot flame appears to let the thermocouple heat up and sense the flame.
  • If the pilot does not stay lit after you release the button, wait five minutes and try again rather than attempting it repeatedly in quick succession.
  • A pilot that will not light after three attempts usually means the gas supply is off, the thermocouple is faulty, or the igniter is blocked.

Locating the Pilot Light Controls on Your Heater

Most wall heaters have a control panel on the front face, usually near the bottom. Look for a knob labeled with settings like "Off," "Pilot," and "On" or a number scale for heat. Next to or below this knob, you will find a button labeled "Ignition," "Spark," or sometimes just a small red or black button. Some heaters have these controls behind a removable cover or access panel that slides or pops off without needing a screwdriver.

If you cannot find the controls on the front, check the side of the unit or look for a small door that opens to reveal them. Your heater's manual will show you exactly where these are located—if you have lost the manual, the model number is usually printed on a sticker inside the access panel, and you can search for it online to find a PDF version.

Preparing the Heater Before Lighting

Before you touch any controls, turn off the heater and wait at least five minutes. This waiting period is important because if gas has been leaking from the pilot opening, it needs time to dissipate. Attempting to light the pilot while stale gas is still present can cause a small pop or flame surge that is startling and unsafe.

Check that the main gas valve to the heater is in the "On" position. This valve is usually located on the gas line leading into the unit and has a handle you can turn. The handle should be parallel to the pipe when the gas is on and perpendicular when it is off. If you are unsure whether gas is reaching the heater, you may smell a faint rotten-egg odor near the unit—that is the scent additive in natural gas, and it means gas is present.

Lighting the Pilot Step by Step

Set the control knob to the "Pilot" position. This setting allows gas to flow to the pilot burner but not to the main heating element. Hold down the ignition button with one hand. With your other hand, hold a lit match or lighter near the pilot opening—this is usually a small hole or tube you can see on the burner assembly, often marked with an arrow or label.

Keep the flame close to the pilot opening and hold the ignition button down continuously. You should see a small blue flame appear within a few seconds. Once the flame is clearly visible and steady, continue holding the button down for another 30 to 60 seconds. This extended hold time allows the thermocouple—a safety device that senses the pilot flame—to heat up enough to keep the gas flowing on its own.

After 30 to 60 seconds, slowly release the ignition button while keeping your match or lighter nearby for a few more seconds. If the pilot flame stays lit, you have succeeded. If it goes out when ready after you release the button, wait five minutes and try again. The thermocouple may not have heated up enough on the first attempt.

What to Do If the Pilot Will Not Stay Lit

If the pilot lights but goes out as soon as you release the button, the thermocouple is likely not sensing the flame properly. This can happen if the thermocouple is dirty or positioned too far from the flame. Wait five minutes, then try again, holding the button down for the full 60 seconds this time. Sometimes a longer hold is all that is needed.

If the pilot still will not stay lit after a second attempt, stop trying for now. Repeated attempts in quick succession can flood the burner with gas and make the problem worse. Wait at least five minutes before trying a third time. If it fails a third time, the issue is likely one of these: the gas supply to the heater is off, the thermocouple needs cleaning or replacement, or the pilot opening is blocked by dust or debris. At this point, you may want to contact a technician or your heater's manufacturer for guidance.

Switching from Pilot to Full Heat Mode

Once the pilot flame is burning steadily and stays lit after you release the ignition button, turn the control knob from "Pilot" to "On" or to your desired temperature setting. The main burner should ignite within a few seconds, and you will hear a whoosh as the larger flame comes to life. The heater will now begin warming the room.

If the main burner does not ignite after you turn the knob to "On," turn it back to "Off," wait a minute, and try again. If it still does not work, turn the knob back to "Pilot" to keep the pilot lit and contact a technician. A main burner that will not ignite even though the pilot is burning usually indicates a problem with the ignition system or gas flow to the main burner itself.

Common Mistakes That Prevent the Pilot from Lighting

The most common mistake is not holding the ignition button down long enough. Many people release it after just a few seconds, before the thermocouple has time to heat up. Hold it for the full 30 to 60 seconds even if the flame appears right away. Another frequent error is forgetting to turn the knob to "Pilot" first—if the knob is on "Off" or "On," the gas will not flow to the pilot burner, and no amount of ignition will work.

A third mistake is trying to light the pilot with the main gas valve to the heater turned off. Check that valve before you start. Finally, some people give up too quickly. If the pilot does not light on the first try, waiting five minutes and trying again is normal and expected. The thermocouple may straightforward need more time to respond, or a small amount of air may be in the gas line.

Frequently Asked Questions

How long should I hold the ignition button down?

Hold it for 30 to 60 seconds after the pilot flame appears. This gives the thermocouple time to heat up and sense the flame. If you release too early, the gas will stop flowing and the pilot will go out once you let go of the button.

What if I do not have a match or lighter?

Most wall heaters have a built-in spark igniter that creates a small spark when you press the ignition button. If yours has one, you do not need an external flame—just press the button and the spark should light the pilot. Check your manual to see if your model has this feature.

Is it safe to light the pilot myself, or should I call a technician?

Lighting a pilot light is a safe, routine task that most homeowners can do. However, if you smell a strong gas odor, the pilot will not light after three attempts, or you are uncomfortable working with gas appliances, contact a technician or your gas company.

Why does the pilot light keep going out after I turn the knob to "On"?

If the pilot stays lit in "Pilot" mode but goes out when you switch to "On," the main burner may be drawing too much gas or the thermocouple may be failing. Try lighting the pilot again and holding the button down for a full 60 seconds before switching to "On." If it still goes out, the thermocouple likely needs replacement.

Can I light the pilot if the heater is still warm from running earlier?

Yes, but wait until the heater has cooled for at least five minutes. A warm heater is not a problem, but waiting ensures any residual gas has cleared and reduces the risk of a flame surge when you light the pilot.