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Quick Troubleshooting Guide for Furnace Issues
Posted On: December 9, 2024
A malfunctioning furnace can be a major inconvenience, especially during colder months. Below is a simple guide to help identify and potentially resolve common furnace issues before calling a professional.
1. Furnace Won’t Turn On
- Check the Thermostat: Ensure it’s set to “Heat” and the temperature is set higher than the room temperature.
- Power Supply: Verify that the furnace is receiving power. Check the circuit breaker and reset it if necessary.
- Pilot Light or Ignition System: For older models, ensure the pilot light is lit. Modern furnaces might have electronic ignitions, which may need resetting.
2. Weak or No Airflow
- Check the Air Filter: A clogged filter can restrict airflow. Replace the filter if it’s dirty.
- Inspect the Blower Motor: Ensure the blower motor is functioning. Listen for unusual sounds or inspect the belt for damage.
- Blocked Vents: Make sure all supply and return vents are open and unobstructed.
3. Furnace Blowing Cold Air
- Thermostat Setting: Double-check that the thermostat is set to “Auto” and not “Fan.”
- Pilot Light or Ignition Issue: If the pilot light is out, relight it following the manufacturer’s instructions.
- Gas Supply: Ensure the gas valve is open and the supply is uninterrupted.
4. Frequent Cycling (Turns On and Off Repeatedly)
- Dirty Air Filter: Replace if clogged.
- Thermostat Placement: Ensure the thermostat is not placed near a heat source, as this can cause incorrect temperature readings.
- Overheating: A clogged filter or dirty blower wheel might cause the system to overheat and shut down as a safety precaution.
5. Strange Noises
- Rattling: Check for loose panels or screws and tighten them.
- Squealing: This might indicate a worn-out blower belt or motor bearings needing lubrication or replacement.
- Banging: Could signal a delayed ignition or ductwork expansion; consider professional inspection.
6. Furnace Leaking Water
- Condensate Line Blockage: Ensure the condensate drain line is clear and unclog it if necessary.
- Clogged Drain Pan: Check and empty the drain pan if it’s full.
- Condensing Furnace Issues: Inspect the exhaust vent or condensate pump for malfunctions.
7. Furnace Not Producing Enough Heat
- Thermostat Calibration: Ensure the thermostat is accurate and functioning correctly.
- Dirty Burner or Heat Exchanger: Clean these components carefully or schedule professional maintenance.
- Ductwork Issues: Check for leaks or blockages in the duct system.
When to Call a Professional
If troubleshooting doesn’t resolve the issue or if you notice signs of a more serious problem (e.g., gas smells, persistent leaks, or electrical issues), contact a certified HVAC technician immediately.
Regular maintenance and timely filter replacements can prevent many of these common issues!
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See What Our Customers Are Saying:
May 9, 2018
I had cold and hot spots all over my 70 yr old home. My furnace is quite new and Greg optimized the fan and furnace. The original installer just took it out of the box with factory settings and installed it- basically running at 50% of capacity. Greg also routed heat into my laundry room, yeah - so now I can renovate laundry room - thanks Greg. He is honest, professional and knowledgeable. I will be calling him back in the spring to optimize my AC as well.
May 8, 2018
Wonderful from beginning to end. I tend to fret and worry about home improvements but the excellent team at TwinTech put my mind as ease. They listen, they are patient and best of all ... the work they did is amazing! I chose the Goodman 80K BTU 2 stage furnace and the matching Goodman air conditioner. Greg, Grant and Poitr "Peter" arrived on time, took great care, explained everything to me and they answered all of my questions. They carefully adjusted the factory settings to optimize the furnace for my house and they also checked the duct work in the basement. Dave, the Sales Manager, came by to say "hello" and to see if I was happy. YES, I am happy with the work! The furnace is very quiet. I have it running on low just to circulate the air in the house and it's so much quieter than my old furnace. When I need new duct work for an upcoming basement renovation TwinTech will be my first choice. I highly recommend TwinTech. PS. They were even nice to my dogs.
Apr 21, 2018
Greg was prompt on the scheduled day of installation and the work was done well within the time estimated beforehand. Installation was neat and the equipment and scope of work was as specified in the quote. One item I must point out is that we were faced with a "No Heat" situation the day before the scheduled installation and Greg came out to address it free of charge. Not only that, but he also corrected an installation fault with our smart thermostat that was not part of the original job, again free of charge.
Mar 16, 2018
Greg came by to do a routine furnace checkup. He was very knowledgeable and professional, letting me know what's being checked/adjusted and giving me tips to ensure everything runs smooth. Very honest and upfront about what's working fine vs. what may need to be fixed/replaced. He didn't attempt to up sell anything that wasn't necessary. I'm glad to have finally found someone I can trust and rely on for all my HVAC needs - furnace, A/C, and hot water tank.
Mar 4, 2018
I'm very happy with the work that was done. Everyone from salesperson to the installers were friendly and professional. They were on time and cleaned up the job site after it was installed. They also answered all my follow up questions promptly. I wouldn't hesitate to work with them or recommend them again.
Feb 28, 2018
Thanks to the team at Twin Tech for a great job installing my new heat pump/ac unit. The guys were very polite and professional. When they left you would never have known they had been there except for the new Mitsubishi unit on the wall!! would highly recommend the Twin Tech team.
Feb 28, 2018
Installed professionally, no delays, no rework needed. Very reliable contractor and sales person. Also installed BBQ gas line and some duct work.
Feb 19, 2018
Greg and Grant are friendly, reliable, and knowledgeable HVAC professionals. The twins, Dave and the entire team provided efficient top quality service. Our family plns to use Twintech for all of our future HVAC needs.
Feb 10, 2018
Very impressed with this company. They show up on time , kept my place clean and after they left it looks like they were never there. Very professional team. Those people know what they doing . Their installation was on the highest standard. They are very knowledgeable especially they're worker Peter. I strongly recommend this company to everybody. After the installation I receive the call making sure I'm satisfied with their products and their job. Bravo!!!
Feb 8, 2018
Greg and his brother were referred to us by a friend. They arrived when they said they would, did an exceptional job and left the place as tidy or tidier then they found it. Their professionalism is only surpassed by their kind and friendly demeanor. Even after several calls to help me with my high tech thermostat I feel that I could always call with any concern (No one responds to my texts as quickly as Greg) and have a friendly helpful response. I found out their grandfather started the company and now as a 3rd generation company, they are doing their grandfather proud. I would highly recommend Twintech over any other hvac company out there.
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