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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:
Aug 8, 2025
We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.
Aug 8, 2025
Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!
Feb 18, 2025
Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.
Feb 18, 2025
We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!
Feb 18, 2025
TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!
Feb 18, 2025
Amazing experience with TwinTech Heating & Cooling! Their team was professional, knowledgeable, and efficient from start to finish. They installed my new furnace quickly and left everything spotless. The technicians took the time to explain everything and made sure I was comfortable with the system before they left. Great customer service and fair pricing. I highly recommend them for anyone needing HVAC services!
Feb 18, 2025
Great experience all around. Bob was sharp and easy to talk to, and Greg handled the installation perfectly. Would hire them again in a heartbeat.
Aug 17, 2024
I returned from vacation to find my AC unit on the Fritz. After calling way too many places I connected with TwinTech. Ive used the company in the past for my furnace so I was happy when I recognized Greg at my front door. Hes great and the service is always top notch. Id highly recommend using twintech for honest, superior service in the Durham region. Thanks!
Aug 13, 2024
I called Twin Tech when my air conditioning stopped working. Greg came over to diagnose the issue - the same day. He was able to diagnose the issue and resolve it quite quickly. Although it was a quick fix, Greg was very thorough in explaining the issue and provided great advice. Not to mention, I felt very comfortable having Greg in my home - which I consider very important when hiring a service provider. Twin Tech will be my go-to from now on. Thank you!!
Aug 12, 2024
Just hired TwinTech Heating & Cooling to do an A/C Unit removal & reinstall to allow for landscaping access on the side of my house, and they were wonderful!
Bob, Greg & Mitch make a great team! Quick appointment times, super knowledgeable, expert troubleshooting capabilities & very customer service oriented.
I would highly recommend them for all of your HVAC needs! Great job guys!!
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