How To Turn Gas Furnace On – 2023 Guide

Gas Furnace Not Heating Up? Here’s Why (and How to Fix) Temperature
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How to Turn Gas Furnace On – 2023 Guide


In this article, we will guide you step-by-step on how to turn on your gas furnace. As the winter season approaches, it’s essential to ensure that your furnace is functioning properly to keep your home warm and comfortable. Follow these simple instructions to start your gas furnace safely and efficiently.

Step 1: Check Safety Precautions

Prior to turning on your gas furnace, it’s crucial to check a few safety precautions. Make sure there are no flammable materials near the furnace, such as paper or cleaning supplies. Additionally, ensure that the gas valve is fully open and that there aren’t any gas leaks in the vicinity.

Step 2: Locate the Furnace Switch

Locate the furnace switch, which is typically located near the furnace or on the main electrical panel of your home. It’s usually labeled as “Furnace” or “Heating.” Flip the switch to the “On” position.

Step 3: Set the Thermostat

Adjust the thermostat to the desired temperature. Set it slightly higher than the current room temperature to activate the heating cycle. Make sure the thermostat is set to “Heat” mode rather than “Cool” or “Off.”

Step 4: Ignite the Pilot Light

If your gas furnace has a pilot light, follow the manufacturer’s instructions to ignite it. Typically, you will need to turn the gas control valve to “Pilot,” press and hold the reset button, and light the pilot using a long match or a lighter. Once the pilot light is lit, continue holding the reset button for a few seconds before releasing it.

Step 5: Wait for Ignition

After igniting the pilot light, wait for a few minutes to allow the furnace to ignite fully. You may hear a clicking sound as the burners start to ignite. This process may take a few minutes, so be patient.

Step 6: Check for Proper Operation

Once the furnace is running, check for proper operation. Ensure that warm air is coming out of the vents and that there are no unusual smells, sounds, or leaks. If you notice any issues, turn off the furnace immediately and consult a professional technician.

Step 7: Regular Maintenance

Regular maintenance is crucial to keep your gas furnace running efficiently. Change the air filter regularly, usually every 1-3 months, to ensure proper airflow. Additionally, schedule annual maintenance with a professional HVAC technician to inspect and clean the furnace, ensuring optimal performance.

Step 8: Safety Tips

When dealing with gas appliances, safety should be a top priority. Install carbon monoxide detectors near the furnace and throughout your home to detect any potential leaks. It’s also advisable to have a fire extinguisher nearby in case of emergencies.

Step 9: Troubleshooting

If your gas furnace fails to turn on or experiences any issues, try troubleshooting before contacting a professional. Check the circuit breaker, ensure the gas supply is not interrupted, and verify that the thermostat is functioning correctly. If the problem persists, seek assistance from a qualified technician.


By following these simple steps, you can safely and effectively turn on your gas furnace. Remember to prioritize safety, perform regular maintenance, and seek professional help if needed. Enjoy a warm and cozy home throughout the winter season!