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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:
Feb 1, 2021
Dave was very pleasant to deal with and Twintech responded quickly when our furnace needed to be replaced ASAP. Installation was done on time and the crew were neat and tidy. We now have a great furnace that suits the needs of our family.
Feb 1, 2021
When your furnace kicks in over the holidays and you're not sure where to turn.. I'm so thankful that this company returned my phone call. I appreciated their transparency and clarity which allowed me to make an informed decision. With various quotes thrown at you, it can be difficult to make the right decision and trust the solutions offered by different companies. TwinTech spoke the truth and delivered on their word. Neat, timely and clean service; the peace of mind I needed during a very cold holiday season. I highly recommend them!
Feb 1, 2021
Pulling a old unit out and installing a modern heating system! Required drilling holes in the wall for the newer pipes. We went from 70% (I am willing to bet it was far less due to lack of maintenance and just old) to 96% newer . It now feels warmer and more pressure and we use to run extra heaters and feel as though they are not necessary!
Feb 1, 2021
I received three quotes before deciding to choose Twintech. Dave's prices was much more reasonable than the competitors. I most appreciated their honest recommendations. Others tried to oversell their products and services. Thank you Dave!
Feb 1, 2021
They had the best price and did a great job on the installation. Recommend them to anyone.
Feb 1, 2021
It was a amazing and professional high quality job
Friendly and very helpful representatives
Thank you for understanding my concern
And explain very well
Overall we pleased with your service
Tanks
May 15, 2020
My 19 year old furnace stopped working when the cold weather hit in November, and I was left without heat. I interviewed several companies and found TWINTECH HEATING and COOLING to be very knowledgeable, quick to respond to my inquiries and very competitively priced.
Dave provided all of the information and pricing ahead of time and set up the appointment for the installation. Greg and Mitch arrived on time to do the installation and worked quickly and efficiently to complete the job.
After the completion of the installation, Dave followed up to ensure that everything was working well and that I didn't have any concerns.
Overall, this was a low-stress and flawless experience from start to finish. I would highly recommend TWINTECH HEATING and COOLING to anyone that requires a new furnace.
May 14, 2020
Our 20 year old furnace broke down during the first cold weekend this past November and our usual HVAC company never returned our phone call. Their loss, missing out on a sale since we didn't want to spend much fixing an old furnace and our 40 year old air conditioner was also long overdue for replacement. We proceeded in obtaining three different quotes for furnace and air conditioner replacement, and proceeded with the one we received from Twintech.
Dave was friendly, knowledgable and accommodating to our schedule and provided with us with a price that fell in the middle of the three quotes that we had. We felt that the Amana furnace and air conditioner he quoted us on were the best products and value offered to us and felt most comfortable with the professionalism and reputation of Twintech.
Greg, Grant and Mitch were at our house for installation the day after we decided to proceed. The guys were friendly and informative, the job was completed efficiently and workmanship appears excellent. Our house is certainly much more comfortable with the new two-stage variable speed Amana furnace compared to the old clunker! And, we're looking forward to enjoying the new air conditioner once summer rolls around again. Thanks Twintech!
May 13, 2020
We are very happy with our new furnace. The service was excellent the guys worked 6 hours straight through and there was no mess at all they took the old furnace boxs etc with them they then explained everything to us they were very helpful and pleasant , when we need a new air conditioner we know who to call!
May 12, 2020
The crew from sales to installation was very professional and had great attention to detail
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