When the power goes out in winter, getting the heat back on becomes priority number one. And once the lights return, many Minnesota homeowners wonder: do you actually need to relight the furnace—or will it just restart on its own?
Here’s the short answer: yes, some furnaces need relighting or resetting after a power outage—but it depends on the ignition system.
Older models with a standing pilot may need manual relighting, while newer furnaces with electronic ignition usually require a system reset—and sometimes a professional.
In this post, we’ll explain how to tell which type you have, what to do after an outage, and when it’s safest to call an HVAC technician.
Introduction to Gas Furnace Safety
A gas furnace is a common heating unit that relies on a pilot light to ignite the burners and provide heated air to a house. Understanding how a gas furnace works and the safety precautions to take during a power outage is crucial to ensure the furnace operates safely and efficiently.
The pilot light is a critical component of a gas furnace, and it’s essential to know how to relight it after a power outage to prevent gas leaks and ensure the furnace is working properly. Regular maintenance of the furnace, including checking the gas valve, blower motor, and circuit breaker, can help prevent issues and ensure the furnace is operating safely.
Steps to Take After a Power Outage
- Wait for power to be restored: Do not attempt to restart the furnace or relight the pilot light while the power is still out.
- Check the thermostat: Ensure the thermostat is on and settings are correct, as power surges can reset it.
- Reset the circuit breaker: Go to your breaker box and check if any breakers for the furnace have tripped. Flip the breaker off, wait a few minutes, then flip it back on.
- Look for a reset button: Many modern furnaces have a reset button (often red or yellow) that may have popped out. If so, press and hold it for a few seconds. Be careful, as pushing it more than once can trigger a safety lockout.
- Relight the pilot light: If you have an older furnace with a pilot light, you will need to relight it. Follow the manufacturer’s instructions carefully. If you are unsure how to do this, it is best to call a professional.
Understanding Power Interruptions
A power outage can cause a gas furnace to lose power, which may lead to several issues, including the pilot light going out. During such outages, it is crucial to take safety precautions to prevent accidents and damage to your furnace. One important step is to turn off the circuit breaker connected to the furnace and ensure the gas supply is shut off. This helps avoid any unintended gas flow or electrical hazards while power is restored.
Many newer furnaces are equipped with electronic ignition systems that can automatically relight the pilot light once power returns. However, it is still important to check the furnace thoroughly to confirm it is operating safely and correctly after a power failure. Understanding how power interruptions affect your gas furnace enables you to take the necessary steps to protect your home and family.
If your furnace does not automatically restart, or if you have an older model with a standing pilot light, you may need to manually relight the pilot. Always follow the manufacturer’s instructions carefully when doing this to avoid gas leaks or other safety risks. If you are unsure about any part of the process, or if your furnace uses an electronic ignition system that does not reset properly, it is best to contact a professional HVAC technician. Their expertise ensures your furnace is safely relit and functioning correctly, keeping your home warm and secure.
Relighting the Furnace
Relighting a furnace after a power outage requires careful attention to safety precautions to ensure the process is done correctly and safely. First, it is essential to confirm that the gas valve is in the proper position, often the “pilot position,” before attempting to relight the pilot light.
Following the manufacturer’s instructions closely is crucial, as improper handling can lead to gas leaks or malfunctioning equipment. The pilot valve and control board are critical components in the relighting process; the pilot valve controls the gas flow to the pilot light, while the control board manages the ignition sequence and safety devices.
Understanding how these parts work together can help you troubleshoot issues and ensure your furnace operates safely after power is restored. If you are uncertain about any step of the relighting process or if your furnace uses an electronic ignition system, it is always best to consult a professional HVAC technician. Their expertise will help guarantee that the furnace is relit properly, maintaining the safety of your home and family.
Checking the Gas Valve and Electrical Systems
After a power outage, it is crucial to thoroughly check the gas valve and electrical systems to ensure they are operating correctly and safely. Start by inspecting the circuit breaker and control panel, as any malfunction in these components can prevent your furnace from working properly. Address any issues you find before attempting to relight the furnace to avoid potential hazards.
Additionally, verify that the gas supply is turned on and functioning as it should; if you detect any gas leaks, address them immediately to protect your home and family. Regular maintenance of both the gas valve and electrical systems is essential to prevent future problems and to keep your furnace running safely and efficiently. By staying vigilant with these checks, you can help ensure your heating system remains reliable, especially during cold weather when you need it most.
Safety Precautions and Maintenance
Safety precautions are critical when working with a gas furnace, as they help prevent accidents and protect your heating system from damage. Regular maintenance plays a key role in keeping your furnace operating safely and efficiently. This includes checking important furnace parts, such as the thermostat, to ensure they are functioning correctly.
Additionally, having your HVAC system inspected regularly can identify potential issues early, allowing for prompt repairs and avoiding costly breakdowns. By taking these safety measures and maintaining your furnace consistently, you can help keep your family safe and ensure the comfort and safety of your home throughout the colder months.
When to Call a Professional
- If your furnace still won’t start after the steps above.
- If you have an electronic ignition furnace that won’t reset.
- If your pilot light won’t stay lit.
- If you suspect damage from a power surge, especially from lightning.
- If you are not comfortable performing the restart or relighting steps.
Contact Neighborhood Plumbing, HVAC and Electrical Today!
Don’t let a power outage leave you in the cold! Whether you need expert help relighting your furnace or comprehensive maintenance to keep your HVAC system running smoothly, Neighborhood Plumbing, HVAC and Electrical is here for you. Our experienced technicians are just a phone call away at 800-570-4328. Call now to schedule your service and ensure your home stays warm, safe, and comfortable all year round!
Frequently Asked Questions
Do You Have to Relight the Furnace After a Power Outage?
Yes, in many cases you do. Older furnaces with a standing pilot light often require manual relighting after power is restored. Newer furnaces with electronic ignition systems may reset automatically but sometimes need a manual reset or professional assistance.
How Do I Safely Relight My Furnace Pilot Light After a Power Outage?
First, ensure the gas valve is in the “pilot” position and the power is restored. Follow the manufacturer’s instructions carefully to relight the pilot. If unsure or uncomfortable, it’s best to call a professional HVAC technician to avoid gas leaks or safety hazards.
Why Won’t My Furnace Restart Automatically After Power is Restored?
Your furnace may not restart due to a tripped circuit breaker, thermostat issues, or a safety lockout triggered by pressing the reset button multiple times. Check the breaker panel, thermostat settings, and control panel for error lights. If problems persist, contact a professional.
What Parts of the Furnace Use Electricity During Operation?
Key furnace parts that require electricity include the blower motor, control board, relay switches, and thermostat. Without electric power, these components won’t function, causing the furnace to shut down during a power outage.
Can I Keep My Furnace Running During a Power Outage?
Most gas furnaces require electricity to operate safety devices and fans, so they will shut down during a power outage. Installing a whole-home generator is the safest way to keep your furnace running when electricity is lost.
What Safety Precautions Should I Take After a Power Outage Before Relighting My Furnace?
Turn off the circuit breaker to the furnace and shut off the gas supply before attempting any relighting. Ensure there is no gas smell or flooding near the furnace. Never attempt to relight if there is water damage or flooding. Always follow safety guidelines or consult a professional.
How Often Should I Schedule Furnace Maintenance to Prevent Issues After a Power Outage?
Annual furnace inspections and maintenance before the heating season are recommended. Regularly replacing the furnace filter and checking the thermostat can prevent unexpected breakdowns and ensure safe operation after power interruptions.
What Should I Do If I Smell Gas After a Power Outage?
Immediately turn off the gas supply and avoid creating any sparks or flames. Evacuate the home and call your gas company or emergency services. Do not attempt to relight the furnace until the gas leak is professionally resolved.
How Do I Know If My Furnace Has a Safety Lockout?
If the reset button will not reset the furnace or if the control panel shows flashing error lights, the furnace may be in safety lockout mode. This usually occurs after pressing the reset button multiple times or detecting a fault. Contact an HVAC professional to diagnose and reset the system.
Are Oil Burners Affected by Power Outages the Same Way as Gas Furnaces?
Oil burners also require electricity to operate components like the fan and control board, so they will typically shut down during power outages. Like gas furnaces, they may need to be reset or serviced after power is restored.
For more answers or assistance, contact a licensed HVAC technician to ensure your furnace and heating system are safe and working properly after a power outage.