$49 / month O.A.C Including Install
$49 / month O.A.C Including Install

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

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.

by Steve V, Toronto on Twintech Heating and Cooling

Our old water tank was installed in 1997. Wasn't working as well as it should so we looked into a tankless as it is more efficient and a space saver! we had used Twintech in the past for a furnace cleaning and were satisfied with that so we decided to ask for a quote for the changeover. Gary arrived and provided the options and the quote fit within our budget so we decide to go with them after receiving a few alternative quotes from other companies. They did what the said would be done and it was completed within a reasonable time frame! Removal and cleanup of the old tank was seamless. We are now enjoying consistent and efficient Hot water! I recommend Twintech and would use them for future projects!

by New AC Unit + Humidifier on Twintech Heating and Cooling

One of the most honest HVAC companies out there! Dave was very helpful and informative in helping us choose a new AC unit. While they weren’t the lowest quote, we went with them because we trusted Dave and he was the most honest guy out of the companies that quoted us.
Greg and his crew who installed the unit were very professional and did a great job. If I could do it over again I would choose Twintech again.

by Private User on Twintech Heating and Cooling

Relocated and replaced our air conditioning unit. Fast, professional, and high quality service. We would definitely use them again for future projects!

by Ian, Toronto on Twintech Heating and Cooling

The term excellent or incredible does not seem high enough praise for the Twintech Heating and cooling company that recently replaced our 15 year old furnace. To start with, the response from Dave at Twintech to our original pricing request was the quickest and most professional of the 5 prices we received which included two of the primary natural gas providers. The Twintech pricing was the most competitive by a considerable margin.
We had Dave visit our home to confirm all pricing which he did and scheduled us for next day installation which was not offered my the majority of the other providers.
The installation; the team arrived on time and provided coverings to all of the hardwood flooring and stairs and proceeded with the removal and reinstallation of the new furnace, the workers predicated six hours and were completed in five hours. I have to mention how courteous and polite the workers were each time we interacted with them from start to finish.
The final result was amazing, all materials were cleaned up and removed from the house and the workmanship very impressive.
One feature that really stood out for me which shows a high level of professionalism was that we had various condensation hoses from the furnace , humidifier and an air filtration unit meeting at the one drain, the installation crew ran PVC tubing including elbows along two sides of the furnace to guide the hoses into one PVC tube at the drain, it looks great!
When the install was completed and tested the Twintech technician guided us through the features and recommendation's for care of the new furnace.
We highly recommend Twintech to anyone for the outstanding service provided to us.

by Stephen, Pickering on Twintech Heating and Cooling

I didn't hesitate to call Twintech in for a 2nd time as they did an outstanding job installing my new furnace last year. This time my 18 year old air conditioner was on its last legs. Greg and the team are top notch, highly skilled technicians. The job was executed in a timely and professional manner. Greg was extremely thorough and went the extra mile to make sure everything was operating efficiently. Lastly, Dave is a true gentleman and really made the customer experience pleasurable and worry free. Always remember that good work ain't cheap and cheap work ain't good.

by Derek, Whitby on Twintech Heating and Cooling

It's so hard to find solid companies these days, but I was very pleased to find one in Twintech. Greg and his crew were very clean, respectful and professional. We were most impressed at how all the things they said they would do, were done. Sounds strange, but usually when a contractor comes to your home they say they will take care of this and that, make sure this is done, etc but when the work starts you have to constantly remind them of your previous discussions. Greg ensured every item he said he would do was done, no reminders required. The work was done right, at a fair price and on time. We will be sure to call them when our A/C unit dies (fingers crossed that's not going to happen too soon :) )

by Patrick, Toronto on Twintech Heating and Cooling

Replaced our aging hot water tank with a tankless system. Excellent work, fast efficient and clean.

Walked us through the new system and recommended maintenance schedule.

This is our second time working with TwinTech and we are very happy with the quality of their work and professionalism.

by Troy, Toronto on Twintech Heating and Cooling

Efficient work and great follow up by the team at Twin Tech. Great product and communication.

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See What Our Customers Are Saying:

by Aaron on Twintech Heating and Cooling

We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.

by Linda on Twintech Heating and Cooling

Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!

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!

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