9 Common Furnace Problems & Fixes

9 Common Furnace Problems & Fixes

Key Takeaways:

  • Furnaces can develop various problems preventing them from functioning correctly, including ignition problems, not heating, strange noises, blowing cold air, cycling frequently, and uneven heating.
  • Other signs of furnace problems include high energy bills, a carbon monoxide leak, and a pilot light that won’t stay lit.
  • An HVAC technician can diagnose and fix the issue to ensure your furnace operates safely and effectively. 
  • Daigle Plumbing, Heating & Cooling offers experienced technicians and top-notch service for all your plumbing and HVAC needs. 
  • If you’re experiencing any signs of furnace problems, contact our HVAC technician today to get your furnace running like new again. 

A furnace is essential in residential and commercial buildings, especially during the cold winter months. It works by heating the air and circulating it throughout the house to keep you warm and comfortable. This process ensures a consistent and cozy indoor environment, shielding occupants from the biting cold and making their living spaces pleasantly comfortable. Furnaces come in various types, such as gas, electric, or oil-based, each with unique advantages and energy efficiency.

Regular maintenance and periodic inspections of these vital heating systems are crucial to ensure they function optimally, guaranteeing both warmth and peace of mind for homeowners. However, like any other appliance, furnaces can develop problems over time that may prevent them from functioning optimally. 

This blog post discusses the top nine most common furnace problems and their fixes. Find the best HVAC technician for all your heating needs.

1. Ignition Problems 

One of the frequently encountered issues with furnaces is ignition failure, where the furnace doesn’t start up. This problem can arise from various sources, including thermostat, a blown fuse, or a tripped circuit breaker. These factors can disrupt the ignition process and prevent the furnace from warming up your home effectively.

What you can do: 

First, check the thermostat to ensure it’s set to the correct temperature and mode. If everything looks okay, replace the fuse or reset the circuit breaker. Proper knowledge and tools are required for the replacement. Consider hiring an HVAC technician if you need help with how to proceed. 

2. The Furnace Is Not Heating Up 

Another common problem is when the furnace runs but doesn’t heat up properly. It could be due to several causes, such as dirty filters, blocked vents, or malfunctioning parts. 

What you can do: 

Check the filter and replace it if it’s dirty. Next, check the vents to make sure they’re not blocked or obstructed in any way. At times, replacing specific parts may be necessary. Avoid DIY repairs and call a qualified HVAC technician for help. 

3. The Furnace Is Making Strange Noises 

Strange noises such as squealing, humming, or banging can indicate that your furnace needs maintenance. Some causes may include worn-out parts, damaged motors, or loose screws. 

What you can do: 

Check the parts of your furnace for any signs of wear and tear. It’s often difficult to figure out the cause of the noise; however, an HVAC technician will swiftly identify the problem and recommend the best course of action.

4. Furnace Blowing Cold Air 

If your furnace is blowing cold air instead of warm, it might be because of a few different problems. It could be because the air filter is dirty, the pilot light isn’t working right, or the ignition system is broken. 

To fix this problem, replace the air filter and clean the pilot light. If that doesn’t work, you might need to replace the ignition system. These systems come in various types, so it’s best to consult an HVAC technician before attempting any repairs. 

5. Furnace Cycling On and Off Frequently 

Furnaces are designed to turn on and off at regular intervals. However, if the cycling happens too frequently, it could be a sign of a more significant problem, such as a clogged filter or too much air in the system. 

It’s best to avoid using the furnace until the problem is fixed. Call a professional to take a look and determine the cause of the issue. They have the proper tools to diagnose and fix the problem safely and efficiently. 

6. High Energy Bills

Unusually high energy bills may indicate a malfunctoning furnace. The reason could be a dirty air filter, leaky ducts, or a malfunctioning furnace component. An HVAC technician can perform an energy audit and pinpoint the source of the problem. They can also recommend energy-saving solutions, such as upgrading to a more efficient furnace or sealing leaky ducts.

Related: HVAC Maintenance Tips Before Spring Arrives

7. The Pilot Light Won’t Stay Lit

If the pilot light on your furnace won’t stay lit, it could be a sign of a faulty thermocouple or gas valve. These parts are crucial in ensuring your furnace’s safety and functionality. 

A reliable HVAC company can diagnose and fix the issue to ensure your furnace operates safely and effectively.

8. Uneven Heating in Different Areas of the House

If you notice that some areas of your home are warmer than others, it could be one of the signs of furnace problems. The problem may be caused by clogged or blocked air ducts, faulty or damaged dampers, or issues with your thermostat. 

An expert HVAC technician can diagnose the problem and provide an appropriate solution, such as duct cleaning, damper repair or replacement, or thermostat calibration.

9. Carbon Monoxide Leak 

A carbon monoxide leak in a house can be life-threatening. This odorless, colorless gas can lead to symptoms like dizziness, nausea, and even death. A malfunctioning furnace can produce carbon monoxide, so a carbon monoxide detector is crucial for early detection and safety. 

If the detector goes off, evacuate the premises immediately and call an expert technician to inspect your furnace.


Need Help with Furnace Problems? Contact A Qualified HVAC Technician Today!

Daigle Plumbing, Heating & Cooling is a family-owned and operated company serving the residents of Salem for over 40 years. 

We are dedicated to keeping your living spaces comfortable and efficient. Whether it’s a leaky faucet, a broken heat pump, or faulty furnace problems, we have the expertise, skills, and experience to handle all your HVAC needs. 

Our highly-trained technicians are dedicated to delivering excellent service, utilizing state-of-the-art tools and

methods to guarantee the seamless operation of your home. Allow us to assist you in achieving the ideal indoor environment.- contact us today!