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Common Furnace Problems and How to Fix Them
Posted On: December 26, 2024
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:
Apr 28, 2022
We wanted to get our AC replaced as it was 22-years old and added to this our furnace was costing more and more to repair. So, we decided to get both the furnace and AC replaced.
After going through a few quotes and product reviews we decided to go with Twintech. The three-men crew arrived early in the morning, wasted no time and got to work right away. By 2:00 pm, they were all done. Ive found their work to be top notch and they were completely professional. I had all my questions answered to my satisfaction both during the progress of their work and at end.
I have pleasure in recommending Twintech to anyone who is looking to get their furnace or Ac replaced
Nathan S.
Apr 28, 2022
Our air conditioner died On a Saturday and within hours Dave came out to take a look and discuss replacement/repair options.
The new air conditioner was installed on the Wednesday. The new unit was installed quickly. The installers were friendly and cleaned up afterwards.
We noticed a slight leak around the furnace that night and they came out the next day and fixed the issue. It has been working great and is quieter than our previous unit.
Very satisfied and would highly recommend TwinTech.
Apr 28, 2022
I contacted TwinTech to replace my 20-year old A/C. Dave, their service rep, promptly replied and was at my home within 2 hours. He was friendly and knowledgeable and didn't try to upgrade or oversell their A/C units but suggested the best fit for my small 1000 feet bungalow. Although this was during a heatwave and very busy, they were able to fit me in 2 days later. The TwinTech crew installed a 1.5 ton Ducane A/C unit that is now running smoothly while maintaining a constant cooling temperature. The crew were very courteous, professional and efficient and I will definitely recommend TwinTech to family and friends. I much appreciated your great service.
Nancy M., Oshawa
Apr 28, 2022
We had a great experience. The guys who installed our a/c did a nice job. Cleaned up.
Apr 28, 2022
excellent crew, fast and efficient! Would call them again when I need a new furnace.
Apr 28, 2022
Professional, courteous and efficient, dont need to say more than that! Use them you will not regret it.
Apr 28, 2022
TwinTech was a pleasure to deal with from the estimate through installation. We replaced a 28 year old a/c unit with one recommended by TwinTech's sales representative Dave who took the time to go over the product with us and answer any questions. The warranty is for 10 years parts and labour and they will complete the registration for you. Installation was by Greg (owner) and Mitch and Spencer who were quick and efficient and left everything clean and tidy.
Apr 28, 2022
Very professional, from the sales consultation and inspection to the final installation. Met every expectations we had for the job. A local business with great client support. We highly recommend. Twintech is a blue chip! Thanks!
Apr 28, 2022
I left a live chat message on their website that my air conditioning was not working. Within 1hr a representative called me to discuss my options.
The next day he came to the house to review my needs and give me a price for a new system. Price quoted was less than I expected and the installation was completed the following day. I found their salesman and the installers very knowledgeable and easy to deal with. All my questions were answered. Everything was properly explained in regards to what unit was needed and why, along with instruction where needed for use.
The installers made sure everything was working properly before they left.
Apr 28, 2022
This is to thank Twintech Heating and Cooling for their exceptional and timely service. Mitch, their technician was very courteous and generous with his time right from his first meeting with us. He not only took the time to check everything but also educated us on why we needed what he recommended. Greg and Mitch graciously accommodated us on our requested day and time for job to be done. They were both very courteous and responsive to our needs and special requests especially in a tight spot. The job was finished neatly and on time. Thank you Twintech for your great service !
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