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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 Private User on Twintech Heating and Cooling

I had them replace my furnace last year. When it came time for the air conditioner this year, I did not hesitate to call Twintech again. I will also have them perform regular maintenance on them.

by Robert, Ajax on Twintech Heating and Cooling

We required a new HVAC replacement after running the old
system for 18 years.
Dave understood our requirements and gave us a quote that
covered all the necessary items.
Installation was fast and very tidy. Everything works as
it should. Our thanks to Greg, Mitch and others for their
excellent work. Recommend this family owned business to
anyone else, considering HVAC or other work.

by John Armstrong, Pickering on Twintech Heating and Cooling

I needed a new furnace and A/C to replace my 21 yr. old units, and went to the internet to view potential companies in May, I received 3 quotes,
and chose Twintech based on their salesman Dave who was very detailed and covered off everything on what Twintech was all about,
an extremely dedicated company with so many years of experience, and after reading the on line reviews I was sold on Twintech, who did not disappoint as the installation team were top notch with Greg leading,
I would highly recommend this company without any doubts, in my books they are first class all the way. Our new Amana furnace and A/C are working perfectly !

by Private User on Twintech Heating and Cooling

Flawless transaction. They did exactly what they promised, showed-up on time, cleaned-up, and were highly professional. Highly recommended.

by Bill Edmondson on Twintech Heating and Cooling

Salesperson and 2 man installation team were all professional and
knew their stuff. All three were friendly and helpful, answering all
my questions. The quality of their work demonstrated their experience
and expertise in their field.

by Private User on Twintech Heating and Cooling

A dear late cousin of mine recommended this company and I have been happy with the service.

by Private User on Twintech Heating and Cooling

We are very pleased with the work done by Twintech. They were very professional from start to finish. Dave came to our home and gave us a very competitive quote for new high efficiency furnace and air conditioner. The installers were very courteous and professional. We would highly recommend them.

by W1n5t0n1987! on Twintech Heating and Cooling

Great experience getting an old furnace replaced.
Sales Guy (Dave) was great - honest, responsive, and friendly.
The work itself was done quickly and we are very happy with the outcome, thank you! We recommend TwinTech!

by Private User on Twintech Heating and Cooling

This review is late coming so my apologies to the amazing Twin Tech team! I contacted Dave at Twin Tech for a quote this past Feb (as I was collecting a few) and his recommendation was excellent. From the first meeting with Dave to the team installing the new furnace, not once did i feel uncomfortable . The team were extremely professional yet personable and clean and tidy. Decent companies still exist!
The new furnace just purrs and its just amazing the difference it has made!
(PS my sibling ended up getting a furnace from them as well)

by Private User on Twintech Heating and Cooling

The service was Twintech was excellent.
Dave our salesperson was easy to talk to and was professional. The unit recommended meets our needs and budget.
Greg and his team arrived on time for the installation and even got rid of the garbage the contractors left in our furnace.
Would definitely recommend Twintech.

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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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