How To Fix Furnace

how to fix furnace

Hi there, my name is Cris and I am a professional HVAC technician. In this article, I want to share my knowledge and expertise on how to fix a furnace. I understand how frustrating it can be when your furnace breaks down, especially during the colder months. That’s why I want to provide you with some helpful tips on how to troubleshoot common problems and fix your furnace.

Common Furnace Problems

Before we dive into how to fix your furnace, let’s first talk about some common problems you may encounter:

  • My furnace isn’t turning on
  • My furnace is blowing cold air
  • My furnace is making strange noises
  • My furnace is cycling on and off frequently
  • My furnace is emitting strange odors

Now, let’s discuss how to troubleshoot and fix these issues.

My Furnace Isn’t Turning On

First, check your thermostat to make sure it’s set to the desired temperature and in the “heat” mode. If the thermostat is working properly, check your furnace’s power source. Make sure it’s plugged in and that the circuit breaker hasn’t tripped. If everything seems to be in order, the issue may be with the furnace’s ignition system or control board. In this case, it’s best to call a professional.

My Furnace is Blowing Cold Air

If the air coming from your furnace is cold, it’s likely that the pilot light has gone out or the flame sensor is dirty. First, try relighting the pilot light. If that doesn’t work, clean the flame sensor with a soft cloth. If the issue persists, it may be a problem with the furnace’s gas valve or control board.

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My Furnace is Making Strange Noises

If your furnace is making unusual noises, it could be due to a variety of issues. Rattling or banging noises may indicate a loose part, while a high-pitched squealing noise may indicate a problem with the blower belt. If you’re not comfortable diagnosing and fixing the issue yourself, it’s best to call a professional.

My Furnace is Cycling On and Off Frequently

If your furnace is turning on and off frequently, it’s likely that the air filter is dirty or clogged. Try replacing the air filter and see if that solves the problem. If the issue persists, it may be due to a faulty thermostat or control board.

My Furnace is Emitting Strange Odors

If your furnace is emitting strange odors, it’s important to address the issue immediately. A burning smell may indicate an electrical problem, while a musty odor may indicate mold growth. In either case, it’s best to call a professional to diagnose and fix the issue.


  • Q: Can I fix my furnace myself?
  • A: It depends on the issue. Some problems, such as a dirty air filter, can be easily fixed by homeowners. However, more complex issues should be left to professionals.
  • Q: How often should I replace my furnace’s air filter?
  • A: It’s recommended to replace your furnace’s air filter every 1-3 months, depending on usage.
  • Q: How can I prevent furnace problems?
  • A: Regular maintenance, such as annual tune-ups, can help prevent furnace problems. It’s also important to regularly replace air filters and ensure proper ventilation.
  • Q: How much does it typically cost to repair a furnace?
  • A: The cost of furnace repairs varies depending on the issue and the location. On average, homeowners can expect to pay anywhere from $100-$800 for furnace repairs.
  • Q: How long should my furnace last?
  • A: With proper maintenance, a furnace can last anywhere from 15-20 years.
  • Q: What should I do if my furnace is leaking water?
  • A: A leaking furnace may indicate a problem with the condensation line or drainage system. It’s best to call a professional to diagnose and fix the issue.
  • Q: Can a dirty air filter cause my furnace to break down?
  • A: Yes, a dirty air filter can cause your furnace to overheat and break down.
  • Q: Is it safe to use a space heater if my furnace isn’t working?
  • A: Yes, it’s safe to use a space heater as a temporary solution. However, it’s important to follow all safety precautions and never leave a space heater unattended.
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Here are some additional tips to help you fix your furnace:

  • Always turn off the power to your furnace before attempting any repairs.
  • Check your furnace’s warranty before attempting any repairs. Some repairs may void the warranty.
  • Regularly replace your furnace’s air filter to prevent issues.
  • Don’t hesitate to call a professional if you’re not comfortable diagnosing or fixing the issue yourself.


Fixing a furnace can be a daunting task, but with the right knowledge and tools, it’s possible to diagnose and fix common issues. Remember to always prioritize safety and don’t hesitate to call a professional if you’re unsure about any repairs.

About Chroni

Hi there, my name is Chroni and I'm thrilled to be a professional writer for Chronitech. As a technology enthusiast with a passion for all things tech, I'm excited to share my knowledge and insights with our readers. With several years of experience in the industry, I've stayed up-to-date with the latest trends and developments in the tech world.

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