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What to Do When Your Furnace Unit Shuts Down
Posted On: September 30, 2024
If your furnace unexpectedly shuts down, it can be stressful, especially in cold weather. Before calling for professional help, here are a few steps you can take to troubleshoot the issue:
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Check the Thermostat
Ensure the thermostat is set to "heat" and the temperature is set above the room temperature. Sometimes, the settings can get changed accidentally, causing the furnace not to kick on.
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Inspect the Power
Verify that the furnace is receiving power. Check the circuit breaker and reset it if necessary. If the furnace is connected to a switch, ensure it’s turned on.
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Replace the Air Filter
A clogged air filter can cause your furnace to overheat and shut down. If the filter is dirty, replace it and see if that solves the issue.
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Examine the Pilot Light or Ignition
For older furnaces, check whether the pilot light is on. If it’s off, you may need to relight it. Newer models may have an electronic ignition, which should be inspected by a professional.
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Check the Furnace Door
Some furnaces won’t operate if the access door is not properly closed. Double-check that the door is securely shut.
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Inspect the Vents
Blocked vents can disrupt airflow, causing the furnace to shut down. Make sure all vents are open and unblocked.
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Examine the Flame Sensor
A dirty flame sensor can cause the furnace to shut off after lighting. If you're comfortable, you can clean it with a soft cloth, but calling a professional might be the best option.
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Reset the Furnace
Some furnaces have a reset button, typically located near the blower. Press it and wait a few minutes for the system to reboot.
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Call a Professional
If none of these steps solve the issue, it’s time to call an HVAC technician. They can diagnose and fix any deeper issues with the system.
Regular furnace maintenance can prevent sudden shutdowns, ensuring your unit operates efficiently throughout the winter months.
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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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