You cannot light an automatic ignition pilot yourself — the system does it for you
A furnace with automatic ignition (also called electronic ignition or hot surface ignition) has no pilot light to light by hand. Instead, an electric heating element or spark igniter turns on when the thermostat calls for heat, and it ignites the gas burner directly. If your furnace has automatic ignition and the burner is not lighting, the problem is not a dead pilot — it is a failed component that needs professional repair.
The confusion arises because older furnaces have standing pilot lights that you can relight manually if they blow out. Modern furnaces with automatic ignition eliminated that step. If you have automatic ignition, you will not find a pilot light valve, a pilot flame, or a reset button marked "pilot" on your furnace.
The only action you should take is to check whether the furnace is receiving power and whether the thermostat is set to heat. If the burner still does not ignite after those checks, the igniter itself has likely failed and requires a technician to replace it.
Key Takeaways
- Automatic ignition furnaces light the burner with an electric element or spark, not a standing pilot flame, so there is nothing for you to light manually.
- If your automatic ignition furnace is not firing, the problem is a failed igniter, a broken thermostat signal, or a power loss — not a blown-out pilot.
- Confirm the furnace has power by checking the circuit breaker and looking for indicator lights on the control board.
- Set your thermostat to heat and raise the temperature above the current room temperature to trigger the ignition cycle.
- If the burner still does not light after power and thermostat checks, contact a furnace technician to inspect or replace the igniter.
How to tell whether your furnace has automatic ignition or a standing pilot
Open the furnace door or access panel and look inside the combustion chamber. A standing pilot light is a small, steady blue flame that burns continuously, even when the furnace is not heating. If you see that flame, you have a standing pilot and can relight it manually. If you see no flame at all, your furnace has automatic ignition.
You can also check the control board or the side of the furnace for labels. Automatic ignition systems are labeled "electronic ignition," "hot surface ignition," "spark ignition," or "direct ignition." Standing pilot furnaces are labeled "pilot light" or "standing pilot." If the furnace was installed after 1990, it almost certainly has automatic ignition.
What to check before calling a technician
First, confirm the furnace has electrical power. Locate the circuit breaker for the furnace (usually labeled "furnace" or "HVAC") and make sure it is in the ON position. If it is OFF, flip it back ON and wait 30 seconds for the furnace to restart. Look at the control board inside the furnace door — most boards have a green or red indicator light that shows whether power is reaching the unit.
Next, set your thermostat to heat mode and raise the temperature setting at least 2 degrees above the current room temperature. The furnace will not ignite unless the thermostat is calling for heat. Wait two to three minutes and listen for the sound of the igniter clicking or humming, followed by the roar of the burner. If you hear nothing, the igniter has failed.
Check whether the furnace has a reset button. Some models have a red or black button on the control board labeled "reset" or "restart." Press it once and wait for the furnace to attempt ignition again. Do not press it repeatedly — pressing more than once can damage the control board.
Why automatic ignition furnaces fail to light
The most common cause is a failed hot surface igniter or spark electrode. These components wear out over time and eventually cannot generate enough heat or spark to ignite the gas. A failed igniter cannot be relit or reset — it must be replaced by a technician.
A broken thermostat or a loose wire between the thermostat and the furnace can also prevent ignition. The furnace will not attempt to light if it does not receive a signal from the thermostat. A technician can test the thermostat and wiring to confirm whether the signal is reaching the furnace.
Gas supply problems are another possibility. If the gas valve is closed, the gas line is kinked, or the gas meter is shut off, the furnace will attempt to ignite but will not light because no fuel is reaching the burner. Check whether other gas appliances in your home (stove, water heater, dryer) are working. If they are not, the problem is likely a closed gas valve or a gas company outage.
When to contact a furnace technician
Contact a technician if the furnace does not ignite after you have confirmed power is on, the thermostat is set to heat, and the temperature setting is raised above the current room temperature. Do not attempt to take apart the furnace or replace the igniter yourself — the igniter is a precision component that must be installed correctly, and the furnace contains high-voltage electrical parts that can cause injury.
A technician will test the igniter, the thermostat signal, the gas supply, and the control board to identify which component has failed. Igniter replacement typically costs between $300 and $500 in labor and parts, depending on the furnace model and your location. If the furnace is more than 15 years old and the igniter fails, a technician may recommend replacing the entire furnace rather than repairing it.
The difference between automatic ignition and standing pilot furnaces
A standing pilot furnace keeps a small flame burning at all times, using a small amount of gas continuously. If that flame blows out, you can relight it by hand using the pilot light valve. An automatic ignition furnace has no standing flame — the igniter only activates when the thermostat calls for heat, then shuts off when the desired temperature is reached.
Automatic ignition furnaces are more energy-efficient because they do not waste gas keeping a pilot flame alive when heat is not needed. They are also more reliable because there is no pilot flame to blow out from drafts or vibration. The trade-off is that when the igniter fails, the furnace cannot operate at all until it is repaired, whereas a standing pilot furnace can still function if you relight the pilot manually.
Frequently Asked Questions
Can I relight the pilot on my automatic ignition furnace?
No. Automatic ignition furnaces have no pilot light to relight. If the furnace is not igniting, the igniter component has failed and must be replaced by a technician. Attempting to light a furnace with automatic ignition can be dangerous because you cannot see where the gas is flowing.
What does it mean if I hear clicking but no burner flame?
Clicking usually means the igniter is trying to spark but the gas is not igniting. This can happen if the gas supply is shut off, the gas line is blocked, or the igniter is too weak to light the gas. Check that other gas appliances work, then call a technician to test the igniter and gas valve.
Is it safe to keep trying to ignite the furnace?
No. If the furnace does not ignite after two or three attempts, stop and call a technician. Repeated ignition attempts can cause gas to accumulate in the furnace, creating a safety hazard. Most furnaces have a safety lockout that prevents ignition after several failed attempts.
How long does it take to replace an automatic igniter?
A technician can usually replace an igniter in one to two hours. The furnace will be out of service during the repair. If you need heat when ready and the repair cannot be scheduled the same day, ask the technician whether a temporary space heater is safe to use while you wait.
Will my furnace work if the igniter is broken?
No. Without a working igniter, the furnace cannot light the burner and will not produce heat. Unlike standing pilot furnaces, automatic ignition furnaces have no backup way to ignite the gas if the igniter fails.