Power Went Out Furnace Not Working : Expert Solution

Power outage can cause a furnace to stop working. Check the thermostat and reset it if necessary. A sudden power outage can cause a furnace to stop working, leaving you in a cold and uncomfortable environment.

It can be frustrating to deal with, especially if it occurs during the winter season. The first thing to do is to check the thermostat and reset it if necessary. In some cases, power surges can cause the thermostat to malfunction, and resetting it may solve the issue.

However, if the furnace doesn’t start working, there could be a problem with the furnace itself. It’s best to call a professional to inspect and repair any damage or issues to ensure your safety and comfort. In this article, we’ll discuss some common reasons why a furnace may stop working after a power outage and what you should do to troubleshoot the problem.

Possible Causes Of Power Went Out Furnace Not Working

The power goes out, and suddenly, your furnace stops working. You’re left with a cold house and, understandably, a lot of questions about why this happened. A power outage can cause several issues that may prevent your furnace from working correctly. Here are some possible causes to keep in mind.

Electrical Issues Due To Power Surges Or System Overload

A power surge can cause electrical issues that affect your furnace, and a system overload can damage your furnace’s electrical components. When electricity returns after a power outage, it can cause a power surge that can harm electrical appliances and devices in your house. To reduce the risk, it’s important to disconnect electrical appliances before power is restored.

Tripped Circuit Breakers

When your furnace stops working, the first component to check is the circuit breaker. It’s possible that a tripped circuit breaker is causing the furnace not to receive electricity. If the furnace has a tripped circuit breaker, resetting it should solve the problem.

Malfunctioning Thermostat

A malfunctioning thermostat can also cause your furnace not to work. If the thermostat is not responsive, check to ensure there are no loose wires or corroded contacts. If there aren’t any problems with the wiring, you may need to replace the thermostat.

Damaged Furnace Components

Furnace components can become damaged during a power outage due to electrical issues such as surges or system overloads. Damaged components can cause the furnace not to work correctly. It’s important to check all components for damage, including fans, heat exchangers, and ignitors.

Importance Of Checking Fuses And Circuit Breakers

Checking fuses is another critical step in troubleshooting a furnace that stopped working after a power outage. It’s possible for a blown fuse to cause the furnace not to receive electricity, which can stop it from working. Always check fuses before replacing them.

How To Reset Circuit Breakers And Replace Fuses

Resetting a circuit breaker is usually a simple task that can solve the problem. To do this, flip the switch to the off position, then back to the on position. Replacing fuses involves unscrewing the old one and screwing in a new one. Always ensure the replacement fuse is the correct type and has the same amperage rating as the old fuse.

How To Handle Power Surges

Disconnect electrical appliances and switches before power is restored to reduce the risk of power surges. Use surge protectors for sensitive electronic devices and appliances. Additionally, avoid using high-wattage appliances until power stability is restored.

Importance Of Checking Thermostat Settings

Always check your thermostat settings when your furnace isn’t working. Sometimes the settings may have been inadvertently changed and can cause the furnace not to come on. Determine whether the thermostat is set to the right temperature and fan settings.

How To Troubleshoot Thermostat Not Responding

First, ensure that the thermostat is on and has power. Check the wiring and connections for any issues and replace any damaged wires. If the thermostat still doesn’t respond, you may need to replace it.

How To Check For Thermostat Damage

Check the thermostat for any signs of damage, such as cracks or broken components. Check for loose or corroded wiring and connections. Clean the thermostat thoroughly, and ensure it has proper power. If there are no obvious issues, use a multimeter to check the thermostat’s continuity.

Importance Of Checking Furnace Components

All furnace components should be checked for potential damage after a power outage. It’s essential to inspect all parts to ensure they are in good working order. Damaged components can cause the furnace to stop working, affect its performance or even be a health hazard.

How To Identify Damaged Parts

Check for any signs of damage or wear on furnace components. Look for rusting on the heat exchanger or fan blades, and inspect the ignition components for wear. If there is any damage, consult a professional to replace the parts.

Common Furnace Components That May Be Damaged

Furnace components such as heat exchangers, fans, and ignition components are the most commonly damaged parts. Always check these components first, and if they appear to be damaged, stop using your furnace and call a professional to repair or replace them.

By following these steps, you can troubleshoot furnace issues that may arise after a power outage, ensuring your furnace works efficiently and effectively to keep you and your family warm.

Steps To Fix Furnace Not Working After A Power Outage

If you’ve experienced a power outage and your furnace is not working, there’s a good chance it’s due to an electrical issue. Luckily, there are a few steps you can take to fix it. Below we’ll cover the possible causes and how to troubleshoot them.

Instruction For Fixing Each Of The Possible Causes Listed Above

  • Check if the furnace has power by checking if the light is on.
  • Check the breaker panel for any tripped breakers and reset them.
  • Check the furnace’s power switch and turn it on.
  • Check the furnace’s fuse and replace it if it’s blown.
  • Check the air filter and replace it if it’s dirty.

Safety Precautions To Take When Handling Electrical Components

Before attempting any of the steps above, it’s essential to take the following precautions:

  • Always turn off the power to the furnace before opening it up.
  • Do not touch any parts if you are unsure if they are safe to touch.
  • When handling wires or electrical components, wear gloves and use a non-conductive tool.

Instruction For Resetting Circuit Breakers Or Replacing Fuses

  • Locate the circuit breaker panel and look for any tripped breakers.
  • Flip the breaker switch off and then back on to reset it.
  • If you have a fuse box, check for any blown fuses.
  • Replace any blown fuses with a new one of the same amperage rating.

Precautions To Take Before Handling Electrical Components

  • Never touch anything metal while working on the furnace.
  • Make sure you have the correct tools and parts before starting.
  • Always use safety equipment such as gloves and goggles.

Step-By-Step Instruction For Troubleshooting Thermostat Issues

  • Make sure your thermostat is on and set to the correct temperature.
  • Check the wiring and connections to ensure they are secure.
  • Replace the thermostat batteries if needed.
  • If this fails, you may need to replace the thermostat entirely.

How To Determine If The Thermostat Needs To Be Repaired Or Replaced

  • If the furnace still does not turn on even after troubleshooting the thermostat, it may be time to replace it entirely.
  • However, if the furnace does turn on after replacing the thermostat, it likely only needed a repair.

Identifying And Replacing Damaged Furnace Components

  • Locate the damaged component, such as the blower motor or fan belt.
  • Turn off the power to the furnace.
  • Remove the damaged part and replace it with a new one.
  • Turn the power back on and test the furnace to ensure it’s working properly.

Safety Precautions When Handling Furnace Components

  • Always turn off the power to the furnace before opening it up.
  • Wear gloves and eye protection when handling furnace components.
  • Do not touch any parts that you are unsure about.

By following these steps and taking necessary precautions, you can fix your furnace after a power outage and avoid costly repairs.

Common Reason Why A Gas Furnace Won’t Turn On

Preventing Furnace Not Working After A Power Outage

Power outages are often an unexpected part of life. They can be a minor inconvenience or a major problem, depending on how you are prepared to deal with them. If you rely on a furnace to keep your home warm during the colder months, a power outage can cause your furnace to stop working.

However, there are steps you can take to prevent the furnace from not working after a power outage. Here are some tips and best practices to avoid issues with your furnace during power outages.

Tips And Best Practices To Avoid Issues With Your Furnace During Power Outages

  • Invest in a generator: a generator can be a significant investment, but it can be a lifesaver during a power outage. A generator can power your furnace, as well as other essential appliances in your home. If you don’t want to invest in a generator, consider renting one during the winter months as a backup plan.
  • Install a battery backup: a battery backup can provide power to your furnace in the event of a power outage. This is a more affordable option than a generator, and it can be installed by a professional.
  • Keep your furnace maintained: keeping your furnace maintained is essential to ensure that it runs efficiently and effectively. Schedule regular maintenance with a professional, and replace filters as needed.
  • Have a backup heat source: consider having a backup heat source, such as a space heater or fireplace, just in case your furnace stops working during a power outage. Make sure you have enough fuel or wood to last for several days.
  • Insulate your home: proper insulation can help your home retain heat, even during a power outage. Seal drafty areas around doors and windows, and add insulation to your attic and walls.
  • Use a programmable thermostat: a programmable thermostat can help you save energy and money on your heating bill. It can also help you regulate the temperature in your home during a power outage. Set the thermostat to a lower temperature during the day when you’re not home and raise it slightly in the evening when you’re home.
  • Prepare an emergency kit: prepare an emergency kit that includes warm blankets, flashlights, batteries, non-perishable food, and water. Make sure the kit is easily accessible in case of a power outage.

By following these tips and best practices, you can ensure that your furnace continues to work even during a power outage. Take the time to prepare for a power outage this winter season and keep your home warm and comfortable.

FAQ For Power Went Out Furnace Not Working

Why Did My Furnace Stop Working After A Power Outage?

After a power outage, your furnace may have shut off due to a safety feature called a limit switch or a tripped circuit breaker. It may also be due to a faulty thermostat or a blown fuse.

How Do I Reset My Furnace After A Power Outage?

Locate the reset button near the blower motor or on the furnace control panel and hold it down for about 30 to 60 seconds. This should reset the furnace and it should turn on automatically.

What Should I Do If My Furnace Still Isn’T Working After Resetting It?

Check the circuit breaker to see if it has been tripped. Verify the thermostat settings, replace the filter, and inspect the air ducts for any blockages. If these steps don’t work, call a professional hvac technician.

Can A Power Outage Damage My Furnace?

Yes, a voltage surge when the power comes back on can damage the electrical components in your furnace. It is best to turn off the furnace during long power outages.


In the event of a power outage, it’s not uncommon for your furnace to stop working. However, there are a few things you can do before calling an hvac technician. First, check your circuit breaker to see if any circuits have tripped.

If they have, reset them and try turning on your furnace again. If this doesn’t work, check the filter to see if it needs replacing, as a dirty filter can cause your furnace to shut down. Finally, if these steps don’t solve the issue, it’s time to call in a professional.

While it may be tempting to try and fix the problem yourself, it’s important to remember that furnaces are complex and potentially dangerous systems, and attempting diy repairs can result in injury or further damage to your system. With regular maintenance and prompt repairs, you can ensure your furnace provides reliable heat all winter long.