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Common Furnace Problems and How to Fix Them

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Common Furnace Problems and How to Fix Them

Posted On: December 26, 2024

Common Furnace Problems and How to Fix Them

Here’s a comprehensive guide to common furnace problems and how to fix them:



1. Furnace Won’t Turn On

Possible Causes:


  • Thermostat is not set correctly.
  • Power issue (tripped circuit breaker or blown fuse).
  • Pilot light is out (for older models).

Fix:


  • Check the thermostat and set it to “heat” mode.
  • Ensure the thermostat is set higher than the current room temperature.
  • Check your home’s circuit breaker panel and reset any tripped breakers.
  • Relight the pilot light if applicable, following the manufacturer’s instructions.

2. Furnace Is Not Producing Enough Heat

Possible Causes:


  • Dirty air filter.
  • Blocked vents or registers.
  • Malfunctioning blower motor or heat exchanger.

Fix:


  • Replace or clean the air filter to improve airflow.
  • Ensure all vents and registers are open and unobstructed.
  • Call a professional to inspect the blower motor or heat exchanger if cleaning doesn’t resolve the issue.

3. Furnace Blowing Cold Air

Possible Causes:


  • Incorrect thermostat settings.
  • Pilot light is out.
  • Clogged condensate drain in high-efficiency furnaces.

Fix:


  • Verify that the thermostat is set to “heat” mode.
  • Relight the pilot light if necessary.
  • Clear any blockages in the condensate drain or contact a technician.

4. Frequent Cycling (Turning On and Off)

Possible Causes:


  • Dirty air filter.
  • Improper thermostat placement.
  • Oversized or undersized furnace.

Fix:


  • Replace the air filter.
  • Make sure the thermostat is not near heat sources like direct sunlight or appliances.
  • Consult an HVAC professional to determine if your furnace is the right size for your home.

5. Furnace Is Making Strange Noises

Possible Causes:


  • Rattling: Loose panels or components.
  • Squealing: Worn blower belt or motor bearings.
  • Banging: Delayed ignition or expanding ductwork.

Fix:


  • Tighten any loose panels or screws.
  • Replace or lubricate the blower belt and bearings.
  • Have a professional inspect the ignition system if you hear banging sounds.

6. Pilot Light Won’t Stay Lit

Possible Causes:


  • Dirty pilot orifice.
  • Faulty thermocouple.
  • Draft in the furnace area.

Fix:


  • Clean the pilot orifice with a small brush.
  • Replace the thermocouple if it’s not functioning.
  • Check for drafts and seal any gaps around the furnace.

7. Furnace Leaks Water

Possible Causes:


  • Clogged or damaged condensate drain.
  • Broken or clogged humidifier.

Fix:


  • Unclog or replace the condensate drain.
  • Inspect the humidifier for blockages or leaks and repair as needed.

8. High Energy Bills

Possible Causes:


  • Poor furnace efficiency.
  • Dirty air filter.
  • Leaky ducts.

Fix:


  • Schedule a professional furnace tune-up to improve efficiency.
  • Replace air filters regularly.
  • Seal any duct leaks with foil tape or mastic sealant.

When to Call a Professional

While some furnace problems can be fixed with simple troubleshooting, others require professional expertise. If your furnace is still not functioning properly after attempting these fixes, or if you suspect a dangerous issue such as a gas leak or cracked heat exchanger, contact an HVAC technician immediately.



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See What Our Customers Are Saying:

by Jaime-Lynne in Pickering on Twintech Heating and Cooling

Greg came over at 9:30pm to rescue my daughter and I from a horrible experience with Enercare that evening. He was professional. Kind. And got us what we needed quickly and at an afford price. I would 100% recommend calling on Greg and his team for any of your heating and cooling needs in the future!!

by Matt C. Oshawa on Twintech Heating and Cooling

Installed a great hot water heater when our old one failed. When my furnace died during cold weather they showed up quickly and my house was warm before my wife got home. :)

by B Davis in Pickering on Twintech Heating and Cooling

I don’t usually right reviews but when you receive service like this I felt it was a must. Honest and fair. I Have 4 children and on Xmas eve my furnace stopped working and a gentleman came out and got me up and running so at least we would have heat for the holidays. As promised he would replace my furnace early in the new year. The job was completed on time, great price for quality furnace and extremely clean and professional job. Would have never known anyone was in the house. Not a spec of dust or mess from lugging out an old rusty furnace. If you have any ac or heating concerns twintech is your only option. I was royally impressed with and I’m sure you will be too.

by stan.marosek from Ajax on Twintech Heating and Cooling

Class Act ! These guys were professional right from the quote stage through to installation. They know their stuff and took their time to help educate me. They take pride in their work and it shows. I would recommend TwinTech Heating and Cooling to anyone. Keep up the great work !!!

by W. Lacombe in Pickering on Twintech Heating and Cooling

This Company is terrific. No high pressure sales and they deliver exactly what they promise to deliver. The new furnace is great and we now get consistent temperatures throughout the house. The installers were great and very efficient and completed the work on schedule on the promised day. Everyone representing this company was very aware of their presence in our house and worked diligently to keep our home as uninterrupted and as clean as was humanly possible. We did not need to go around the house to clean up after they left, what a nice surprise. We have had follow up by the company to ensure everything is to our satisfaction. How unusual in today's environment. The impression left by Twintech is that they care about us and our home. This is so refreshing in today's high tech world. Out thanks go out to Dave in sales and G, G, and P (the installers).

by jiinyiong in Ajax on Twintech Heating and Cooling

They were Timely and professional. They were very Knowledgeable with answering all of my questions.

by Connie in Pickering on Twintech Heating and Cooling

The entire process was prompt and professional, from the initial quote to the installation of the new furnace. The team installed the new furnace and removed the old one in approx. 4 hrs. The guys were very knowledgeable and gave me lots of information. I have used Twintech before for a new A/C installation and new I was in good hands.

by Valentine in Pickering on Twintech Heating and Cooling

The overall experience dealing with this company was great from start to finish when getting a new furnace and ac this year. Everything was clearly explained to us during our consultation with Dave and there were no surprises with added costs. The work was done as expected and their response time to inquiries were very timely generally within a few hours or less. They are all very professional and was a pleasure to do business with them. Highly recommend to anyone looking for honest quality professional service.

by Jiri in Toronto on Twintech Heating and Cooling

From the initial contact we had an excellent experience with this company and all its personnel. Dave Gergley was an excellent, helpful, sales person and solicitous of our needs. He recommended only what was required and did not up sell or make any suggestions for products that we did not need, such as a new A.C. He explained the rebate process and basically outlined how to get the best furnace at the lowest price. When it was time for installation, the technicians could not have been more considerate, careful, attentive to detail, obviously committed to safety and optimum functioning of the appliance they were setting up. We have been perfectly satisfied with the functioning of the furnace and all aspects of acquiring it from the initial contact with Dave through to the installation process and follow ups inquiring about our satisfaction. Also they initiated the rebate process and contacted the appropriate inspection agency to carry it out. We highly recommend this company for all heating and cooling needs and we will contact them again when it is time to replace our A.C.

by Drew in Pickering on Twintech Heating and Cooling

Twintech was excellent from the initial quote and throughout the install. They had a competitive rate for hot water tank and ended up buying the tank from them, had them remove the old tank and install the new one. The day of install they were prompt and out in about 2 hours. Professional , courteous really great guys. We took a look at my 30 year old furnace and they were able to offer some suggestions for future there too.

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See What Our Customers Are Saying:

by Robert Rogers on Twintech Heating and Cooling

Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.

by Robert Mizuno on Twintech Heating and Cooling

We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!

by Ruth on Twintech Heating and Cooling

TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!

by Anna Chin on Twintech Heating and Cooling

Amazing experience with TwinTech Heating & Cooling! Their team was professional, knowledgeable, and efficient from start to finish. They installed my new furnace quickly and left everything spotless. The technicians took the time to explain everything and made sure I was comfortable with the system before they left. Great customer service and fair pricing. I highly recommend them for anyone needing HVAC services!

by Connor Agnew on Twintech Heating and Cooling

Great experience all around. Bob was sharp and easy to talk to, and Greg handled the installation perfectly. Would hire them again in a heartbeat.

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