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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:
Jul 28, 2022
On coldest night of the year our furnace quit. At 8:40 in the morning Greg arrived and gave us a diagnosis and a recommendation. By 2:30 we had a new furnace and were warm again. Great company. Great customer service. Good reasonable price.
Peter, Pickering
Jul 3, 2022
Twin tech team was very efficient and prompt. They provided a quote within hours of request and got the job done on time. No disruption to home function. We would highly recommend this team. Job well done.
Jul 3, 2022
Our furnace bit the dust, and Twintech came out to troubleshoot and diagnose the problem within a couple of hours. Mitch was super helpful, patient, and answered all of our questions. When we decided to get the furnace replaced, the crew was over first thing the next morning and did a fantastic job. Not only did they complete the job in a few hours, but they cleaned up and respected our house as they went, and answered all of our follow-up questions. I've used Twintech for our HVAC needs in the past and will continue to do so. I'd recommend them to anyone, and it feels good to support a local, family-owned business.
Jul 3, 2022
Dave and the Twintech team were fabulous from day 1 and helped us through the process to identifying a new furnace and AC unit. This was our first time through this process and Dave did a thorough job explaining all the components and was very patience answering all our questions. Dave provided great insights and fair pricing.
The Twintech team did an awesome installation. Very clean and efficient. I would highly recommended their service.
Jul 3, 2022
We had a new Amana furnace installed by Twintech and we were very pleased with the installation. It is nice to have a warm house again.
Jul 3, 2022
Excellent job. Excellent service. Competitive price. Its rare to find a company with the knowledge and professional results we have experienced with Twintech. The clean and neat installation with attention to detail and drop sheers to respect our property is a clear indication of Twintechs high level of integrity. The 1-1/2 gas line upgrade they did for our pool 3 years ago was awesome. Can't say enough. Thank-you Twintech.
Jul 3, 2022
Twitch did a great job with the installation of our new furnace. I really appreciated their honesty and I could trust what they were telling me. Another company tried to suggest significantly more work at a greater cost claiming it was necessary to meet current building code. Twintech is very fair. All staff I meet were friendly, polite and trustworthy. I would recommend Twitch for a furnace.
Jul 3, 2022
This is a professional team that's easy to deal with. I would strongly recommend them
Jul 3, 2022
Very professional firm from start to finish!
They removed the old oil tank and furnace. They installed air conditioning and a new propane furnace.
Professional installation, on time and no mess.
Very pleased with their work and would highly recommend the company. Our house is three stories so they spent the time to do all the calculations to make sure we would have great performance on each floor.
Thank you again!
Jul 3, 2022
Upon a routine yearly maintenance, it was discovered there was a leak in the heat exchanger and a I needed a new furnace. I know nothing about these things and was completely stressed out. The company I had the maintenance plan with quoted me a huge number to rent a furnace, I just wanted to cry. Then I spoke to Dave at Twintech. He was so knowledgeable and calming, provided me a fair quote and within a few days I had an amazing crew show up to my house and install my new energy efficient furnace! I have already recommended these wonderful people at Twintech to a good friend of mine. Thank you Twintech!!
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