How To Reset Furnace? Quick Troubleshooting Tips


When encountering furnace issues, understanding furnace reset can be helpful. It’s a process of restarting the heating system. To execute it, decide if it’s a soft or hard lockout. Soft? Just turn off the power switch or breaker box for 30 secs then power it back up. Hard? Press the reset button on the control unit and wait for a small flame to appear.

Furnaces need maintenance. Clean/replace filters, check electrical components and wiring, and ensure proper fuel gauge readings in oil furnaces. Dirty air filters and clogged filters are common causes of furnace issues. Check sensors when resetting as well. Lockouts occur due to error codes that tell you what’s wrong.

Consult your furnace owner’s manual for specific info about your model. Troubleshoot basic heater problems like thermostat malfunctions properly.

To avoid common HVAC problems, keep up with preventive care. Inspect regularly, replace components (like filters) on time, and upgrade through smart thermostats. And remember, there are various types of furnace lockouts.

How To Reset Furnace

Image of a furnace with different components

Types of Furnace Lockouts

To understand the different types of furnace lockouts, let me guide you through the process of resetting your furnace. 

This is especially important when you’re facing issues with your furnace’s heating system. In this section, we will explore the two most common types of furnace lockouts: 

  • soft lockouts
  • hard lockouts.

Soft lockout

A soft lockout is a temporary shutdown initiated by a furnace’s control board when it detects an issue. It’s to protect the system from damage. Soft lockout usually lasts an hour. During this time, the furnace attempts to figure out and fix the problem.

The control board takes specific actions, depending on the issue. If there’s a gas valve or flame sensor issue, it can switch off the gas supply to avoid dangerous situations. After an hour, another trial will start, leading either to successful ignition or a hard lockout if the system still has an issue.

Don’t start your furnace immediately after a soft lockout. Wait at least an hour before restarting. 

Tip: Contact a licensed professional if dealing with any type of furnace lockout, instead of attempting to diagnose and fix it yourself. 

Hard lockout

A ‘severe lockout’ is a tricky situation that takes place during furnace operation. It’s essential to take quick action, as it affects the safety and performance of the entire heating system. 

Here’s a 3-step guide to tackle this issue:

  1. Turn off the power from the thermostat and breaker box.
  2. Work out the cause, some typical triggers are gas pressure abnormalities, faulty flame sensors or ignition modules.
  3. Consult an expert for repairing as hard lockouts needs professional knowledge and advanced tools. It’s important to have help from seasoned HVAC specialists.

Remember, each type of furnace lockout has its own difficulties. Hard lockouts can be due to combustion problems, while soft lockouts may be caused by clogged filters or blocked air ducts. It is critical to recognize the differences to determine the right solution for each difficulty.

Furnace states that “regular maintenance can increase your furnace’s lifespan and enhance its performance.” Let’s hope that unblocking the furnace is simple.

How to Reset Furnace

To reset your furnace and restore heat to your house, follow these steps and precautions in proper order

Begin by taking all the necessary precautions. After that, learn how to locate the reset button or switch accurately. 

To continue, shut off the furnace’s power supply before you even consider resetting it. Next, go through the resetting process as per the manufacturer’s guidelines, and finally, turn the power supply back on.

Proper Precautions Before Starting

Before you reset your furnace, make sure to take the necessary precautions. 

Follow these 4 steps:

  1. Turn off the thermostat and wait. Wait for at least 10 minutes or until the blower has stopped running.
  2. Locate the circuit breaker or fuse box. Turn it off to avoid electric shock.
  3. Check the filter. If there is accumulation, replace it.
  4. If you smell gas, evacuate your home and call an expert.

Remove any flammable materials from around the furnace before resetting. Follow safety guidelines. You should also check wires, electrical connections, and do regular maintenance on your furnace. This will increase efficiency and extend its life span.

Resetting your furnace is like hitting the ‘refresh’ button. It might solve the problem.

Locate the Reset Button/Switch

Locate the reset button/switch. It varies, so check the instructions in your furnace manual or a sticker on the side of your furnace.

3-Step Guide to Locate the Reset Button/Switch:

  1. Near the blower motor or gas control valve
  2. A red button labeled “RESET” or a switch.
  3. In your furnace manual or call a technician.

Be careful with resetting as it can damage the furnace. Also, if you reset often, there may be an issue that requires professional attention.

To reduce resets, change air filters regularly and get annual inspections by a licensed technician. 

Additionally, look for obstructions around your vents that can hinder airflow. Take these steps to keep your furnace running all winter. Remember to turn off the power supply before resetting.

Turn Off the Power Supply

For safety, switch off the power to your furnace before resetting it.

  1. Find the main switch or breaker that supplies power to the furnace.
  2. Flip the switch or breaker to cut off electricity to the furnace.
  3. Wait a few moments to be sure that there is no electric current running through the system.

Never touch any electrical parts of your furnace without first turning off the power. Doing this will prevent electrocution and possible damage to the furnace.

Take steps to protect yourself before fiddling with any other part of your furnace. Resetting the furnace is like snoozing your alarm on Monday, it’s not fun, but needed for everything to work again.

Resetting Process

Ready to fire up your furnace? Let’s get started with ‘Restarting the Furnace’. 

Here’s the 4-step guide you need:

  1. Find the furnace switch and turn it off.
  2. Wait 30 seconds before switching it on again.
  3. Press and hold the reset button/switch for 3-5 seconds.
  4. For an electronic ignition, set the thermostat to ‘Heat’ mode. Wait 1-2 minutes before adjusting the temperature. With a standing pilot light, relight it as per manufacturer instructions.

Don’t restart your furnace more than twice. If it still won’t start, contact a professional.

Turn On the Power Supply

Locate the power switch and turn it on with a switch or dial to power on your furnace. 

Here’s a step-by-step guide to help you get it going.

1Find the furnace power switch.
2Make sure circuit breakers are in the “on” position.
3Turn on the gas valve for gas to flow into your furnace.
4Check the emergency shut-off switch is switched on.
5If your system has a pilot light, turn it on following manufacturer instructions.

Note that furnaces should only be handled by professionals to avoid risks or errors.

For better results, do regular maintenance checks and seek pro help for repairs and parts replacement. says: “Dirty air filters are the most common reason furnaces fail prematurely”.

Steps to Reset Different Types of Furnaces

To reset your furnace after a soft or hard lockout, you need to follow a different process based on the type of furnace you have such as gas, oil, and heat pump. 

In this section, we’ll explore the steps required to reset each furnace type so that you can get it up and running again. We’ll cover the different issues that may be causing the lockouts and the necessary steps you need to take to resolve them. So, let’s dive into the sub-sections for gas furnace, oil furnace, and heat pump to see how to reset your furnace.

Gas Furnace

A gas-powered heating system reset is essential if the furnace stops working properly. 

Five steps to do this:

  • Increase the thermostat’s temperature above the room’s.
  • Turn off the furnace’s main power switch.
  • Locate the circuit breaker panel. Find the breaker related to the furnace and make sure it’s turned on.
  • Wait for 30 seconds then switch the primary power switch back on.
  • If this doesn’t work, call a technician. DIY methods may cause harm or damage.

You should know that a reset doesn’t solve all problems. Professional help should be considered if the issue persists.

Fun fact: The Huffington Post states that regular maintenance can add an extra 30 years to a gas furnace’s life.

Oil Furnace

When your oil furnace starts to malfunction, it may need to be reset. Start by checking if it has power and fuel. 

Then, press the red button on the primary controller or stack control. Look for any clogs in the fuel valve or nozzle and replace if needed.

However, some furnaces may have more complex resetting procedures. So, it’s best to consult a professional technician before attempting any resetting.

It’s also important to get annual inspections and cleanings to maintain your oil furnace. This will help keep it efficient and long-lasting, while also reducing health and safety risks.

Knowing some simple steps like checking power, fuel levels, pressing reset buttons, and cleaning parts like valves and nozzles can help avoid cold weather discomfort and expensive repairs. 

Heat Pump

Let’s dive into the exciting topic of air source heat pumps. These furnaces utilize outside air for energy, making them efficient and eco-friendly.

For your convenience, we’ve made a table of the different types of air source heat pumps and their resets. Here it is:

Type of Air Source Heat PumpReset Method
Single-stageTurn off power for 60s and switch back on.
Multi-stage or Variable speedDisconnect power then reconnect after 10 mins.

Keep in mind that the reset method can vary by model, so ask a HVAC specialist if you’re uncertain.

Plus, remember to change or clean your furnace filters every three months. This will help keep your home running smoothly.

Did you know? Almost half of home energy is used for heating and cooling. You can be the hero of the day and troubleshoot your furnace problems!

Troubleshooting Furnace Issues

To troubleshoot furnace issues, you need to identify the underlying problem at the earliest possible to save yourself the hassle and expense. 

If you’re trying to reset your furnace with no success, here’s a guide to help fix common issues. 

The sub-sections to follow will address possible causes, steps, and solutions to problems regarding dirty air filter, clogged filter, electrical components, pilot light, sensor issues, and thermostat.

Dirty Air Filter

If the HVAC system’s air filter is polluted, then it’s time for a change. Dirt, pet hair and debris can build up and restrict airflow. 

This can:

  • Make the furnace harder to heat up
  • Damage the limit switch
  • Cause breathing problems for people with allergies or asthma
  • Shorten the furnace life span
  • Make the blower motor work harder and longer

Replace your air filter every three months or more often if you have pets, allergies, or live in a dusty area. 

Clogged Filter

Is your furnace airflow decreasing? It could be because of Restricted Air Flow, inefficient fan operation, or something wrong with your Internal Duct Work. 

Here are four things to check:

  • Check and replace your air filter.
  • Clear dirt and debris from vents.
  • Open all vents to maximize airflow.
  • Look for blockages in the ductwork, especially at their endpoints.

A clogged filter reduces air circulation, making your furnace less efficient and potentially damaging it. If you don’t create alternative routes, a too-restrictive filter can even cause harm.

If you hear unusual noises or a sharp decrease in circulation, get professional help. An HVAC technician can help you identify the obstruction. Don’t let your furnace become a disco party with sparks, hire an electrician.

Issues with Electrical Components

When it comes to your furnace, electronic components such as sensors, control boards and motors can be the cause of any issues. 

To troubleshoot them, check all connections and wiring for signs of damage or wear. Use a multimeter to check voltage levels to make sure everything is running correctly.

It’s best to leave repairs to a professional. Tampering with these parts can lead to injury or further damage.

To prevent problems in the future, annual inspections and regular filter changes are key. This ensures all parts are running efficiently and keeps your home warm and comfortable. 

Don’t forget, if your pilot light keeps going out, it’s like a game of hide-and-seek, and you’re always ‘it’.

Pilot Light Problems

The pilot light of the furnace can malfunction, leaving the whole system inoperable. It’s a small flame that ignites gas for the furnace. 

It may be due to a clogged or dirty sensor, faulty wiring, or a faulty thermocouple. Check for gas leaks before relighting it.

Faulty gas valve or ignitor control modules are other potential causes. If troubleshooting doesn’t help, contact an HVAC technician for assistance.

Experts at HomeAdvisor report that 1 in 3 furnaces don’t work properly due to lack of maintenance and timely repairs. 

Sensor Issues

The furnace sensor can cause trouble with temperature control and even shut down completely. 

To try and fix it, first check the thermostat settings and replace the batteries. Also look for damage or loose connections in the wiring. 

Is the sensor dirty or blocked? This could affect its accuracy and performance. Cleaning the sensors regularly can stop future issues.

Pro Tip: Get a professional to check the furnace regularly. That way, any issues can be spotted before getting worse.

Thermostat Problems

Having issues with your furnace? It could be related to the Climate Controller that controls the temperature in your house. 

Check out the owner’s manual, or get a technician to help. If it’s not working right, you may need to repair or replace it.

For furnace issues, call an HVAC technician. They can take care of the problem safely and make sure it follows all regulations. Don’t leave it too long, as it can get expensive if not fixed right away.

If you have thermostat or furnace issues, contact a licensed technician as soon as possible. Taking swift action can avoid any further problems and expensive repairs. Don’t forget, regular maintenance can keep you warm and cozy.

Furnace Repair and Maintenance

To maintain your furnace, manage issues, and understand furnace repair, the “Furnace Repair and Maintenance” section of this article is the perfect solution. 

Whether your furnace is experiencing power issues or not heating properly, each sub-section provides different techniques, processes, and tips that can help with your furnace repairs.

Regular Cleaning of Furnace Filter

Maintaining a clean furnace filter is important for optimal furnace functioning. 

Here’s how you can keep your furnace filter in top shape:

  • Regular Cleaning: Clean your filter every month if you have pets or allergies. Otherwise, do it every two to three months.
  • Using Proper Tools: Use the right vacuum attachments and cleaning tools to get rid of dirt, dust, and debris.
  • Replacing Furnace Filters: Replace worn-out filters with new ones to improve air quality and protect your heating components.

Remember to keep up with furnace filter cleaning. It’ll stop any harmful particles from entering your home’s ventilation system. For best results, book seasonal HVAC maintenance checks. If your circuit breaker trips too often, check the fuse box and give it a talking-to.

Checking Circuit Breaker and Fuse Box

To keep electrical systems in furnaces in optimal condition, you must inspect the power source. 

Here’s how to check the electrical power supply of your furnace through examining the circuit breaker and fuse box:

  1. Switch off the furnace – To avoid electric shocks or short circuits, turn off the furnace.
  2. Locate the panel – Look for the circuit breaker or fuse box connected to the furnace.
  3. Check labels – Check for error messages, such as “tripped” circuits or faulty fuses.
  4. Replace or reset – Flip the switch on tripped breakers or replace broken fuses. If you’re unsure, better to call a licensed professional.
  5. Test – Turn on the furnace after repairs. If it trips again, discontinue use and call a technician.

Remember that not taking care of circuit breakers can cause damage to your home. So, schedule yearly maintenance with a local expert. It is worth noting that regular examination of circuit breakers and fuse boxes saves money in the long run. 

For example, a home did not take regular care of their faulty furnace, only realizing the costly repairs after an exorbitant power bill. 

Regular inspection of your furnace is like going to the dentist, it’s not always fun but it saves you from a lot of pain in the long run.

Regular Inspection of Furnace

Routine examinations of heating systems are key for efficient furnace maintenance. Consistent evaluations ensure excellent performance and help troubleshoot problems quickly. 

Inspections detect worn-out components, wiring issues, and leaks that need fixing.

An HVAC professional checks the furnace’s internal components, thermostat, burners, ignition system, control board, and air filters. They also check electrical connections and safety shut-off switches. Regular inspections reduce the chance of expensive repairs.

Checking carbon monoxide detectors is important to avoid poisoning events. Detectors alert homeowners about gas leaks from heaters, furnaces, or chimneys. NFPA recommends one detector on each floor.

Furnace maintenance keeps heaters running during cold weather and increases their lifespan while minimizing repair costs. DIY repairs can be a hot mess and a cold wallet. Best to leave it to the HVAC technician.

Importance of HVAC Technician for Furnace Repair

Skilled HVAC technicians are key for furnace repair and maintenance. They understand complex mechanical processes, allowing them to keep energy costs low. 

They make sure furnaces are safe by preventing gas leaks and other issues. Plus, they have great communication skills. They explain each step clearly, so homeowners know what’s going on.

For instance, a homeowner heard noises, the technician quickly found the cause of the problem, replaced the blower belt, and gave advice on future care.

In summary, HVAC technicians keep furnaces running smoothly with timely repairs, safety checks, and advice. Homeowners can trust them to handle even tough issues. Resetting your furnace is like hitting reset, it is important for performance, but more expensive if you spill coffee.


Proper care and maintenance of your furnace are musts. Replace filters regularly and keep blower compartment clean. This may avoid dirty air or clogged filters. Resetting the furnace can be major help in resolving certain lockout issues. Locate the reset button. Hold it for 30 seconds, then release. If it doesn’t work, switch off power. Use either the toggle switch or breaker box for a few minutes. Follow safety precautions and read owner’s manual. Troubleshooting may be needed if resetting doesn’t work. Check sensors or electrical components. Consult a professional HVAC service for an accurate diagnosis and repair. My furnace went into a hard lockout with the smart thermostat. Resetting multiple times didn’t help. So I called an expert. He detected an error in the control board needing replacement. I learned to call pros when necessary, not just rely on online research and DIY methods.