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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 2, 2017
Very impressed they arrive to quote even though I had forgotten to call them back to confirm date & time. They showed the day before installation to deliver the unit. Returned the next day as promised at 9am. Project was completed in a professional manner. They even fixed a few things that they noticed were not installed correctly, or to code by previous heating & air contractors we had at our residence before. Would recommend this company to everyone!
Jun 29, 2017
Greg removed old oil furnace and oil tank from basement relocated new Napoleon propane furnace to allow duct work to be rerouted to a much more suitable location. Moved air conditioner to the new furnace. Dave recommended two available grants to assist with cost. They kept to their original quoted price which was substantially lower than a competitors for the same furnace and work. They completed the work as stated when stated and left the area clean and tidy. We are very pleased with the outcome.
Jun 28, 2017
Twintech installed a Goodman furnace and ac init. Very professional install, both units are working well.
Jun 28, 2017
We had Grant and Greg Dainty quote to replace our 20 yr old furnace. I have known them for years and have had other jobs done by them ( AC and Pool Htr). The price was very reasonable and the job was completed in one day.
Jun 23, 2017
TwinTech was the right choice. Our consultation with Dave set the tone. Professional and knowledgeable, we even received a follow-up call within hours of our install completion, wow! TwinTech arrived as scheduled to install our A/C unit. Within minutes of arrival Greg noted and explained a few out of code faults on our furnace installed by another company, problems fixed, thanks TwinTech. Greg, Grant and "Subaru" Pete were meticulous start to finish. Highly recommended!
Jun 13, 2017
Twintech replaced our aging +20 yrs old Furnace & AC with the variable high efficiency Napoleon Furnace matched with the Goodman AC. Sales guy ,Dave was great, gave a no pressure estimate, explained about the Government Rebate program which they took care of completely including arranging the home energy audit. On the scheduled day Greg and his team arrived on time, did a great job and completed the same day , extremely professional and courteous, cleaned up everything , tested the system, Greg took his time to explain the setup. Very impressed with the Napoleon Furnace 9600 which did a great job in maintaining a comfortable temperature last winter and now with the hot weather the Goodman AC cooled the house in much less time than the old AC unit could ever. From start to finish Twintech were great and have no hesitation in recommending them 100%.
Jun 13, 2017
The Twintech team did an excellent job installing our new Goodman air conditioner. They were polite and professional. Greg was knowledgeable and clearly experienced. Thank you Twintech for bringing our cooling system up to current regulations. Job well done!
Jun 11, 2017
Dave from TwinTech was very knowledgeable, professional and thorough in the buying process. He helped us to identify the best furnace for our home and our budget. When we needed a new filter a year later and seemed to have a problem finding the right one, I called Dave up and he delivered a filter to me the next day! The cost was on par with other retailers, but it was this unexpected personal service that really was impressive. The furnace? Works like a charm.
May 27, 2017
Imagine, it's 5 minutes after the midnight countdown New Year's eve and the furnace quits. We called TwinTech fully expecting to leave a message and actually spoke with Greg, one of the owners! We had an immediate repair early the next morning & a new furnace within the week. We have entrusted TwinTech with all our home HVAC service needs for over 6 years. That's why this week with an opportunity to purchase a new BBQ, we called them 1st to see about a gas line install. It's chicken on the grill tonight! They are efficient, reliable, honest, hard working, and -- attentive is an understatement.
Jan 19, 2016
Wonderful customer service, starting from the job quote (Dave), to the clean install, to the follow-up. Twintech is a small company which installed my Napoleon furnace, A/C, John Wood tank, and ran the line for my gas dryer. The installation was completed as promised in one day. The work area was kept very clean, and they even took care of my old rental tank. The professionalism and wonderful customer service is second to none. They completed all of my rebate paperwork, and now I'm getting $2000 back! You will not be disappointed if you hire this company for your project.
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