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Why Does My Furnace Keep Turning Off?

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Why Does My Furnace Keep Turning Off?

Posted On: October 21, 2024

Why Does My Furnace Keep Turning Off?

If your furnace keeps turning off unexpectedly, it's a sign of an underlying issue that needs attention. Here are some common reasons for this problem:


1. Overheating

A furnace may turn off if it's overheating due to a clogged air filter or restricted airflow. This is a safety measure to prevent damage to the system. Regularly changing your air filters can prevent this from happening.


2. Thermostat Issues

A malfunctioning thermostat can cause your furnace to turn off prematurely. Ensure the thermostat is set to the correct mode and temperature, and replace the batteries if needed.


3. Dirty Flame Sensor

The flame sensor detects if the burners are lit. If the sensor is dirty or damaged, it may not sense the flame and shut off the furnace to avoid gas buildup. Cleaning or replacing the flame sensor could solve this issue.


4. Short Cycling

Short cycling occurs when the furnace turns on and off frequently. This could be due to an oversized furnace, a faulty thermostat, or a clogged vent. Short cycling strains the system and reduces efficiency.


5. Blocked Exhaust Vent

A blocked vent pipe can trigger safety mechanisms, causing the furnace to shut off. Check for obstructions like debris or ice, especially in outdoor vents.


6. Limit Switch Problem

The limit switch monitors the temperature inside your furnace. If it’s faulty, it might shut down the system prematurely. A professional can inspect and replace the limit switch if needed.


If you're unable to identify the issue, it’s best to contact a professional HVAC technician for a thorough inspection and repair. This ensures your furnace operates safely and efficiently.



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by Floreene in Whitby on Twintech Heating and Cooling

My old furnace had finally broken down for the last time when contacted twintech to have a new furnace installed…They were prompt, knowledgeable and very reasonably priced. They did such a great job i tell all my friends and family about this company.

by Damien McIsaac. Ajax on Twintech Heating and Cooling

To whom it may concern, I recently had TwinTech (Greg and Grant Dainty) replace my furnace and service both my gas fireplaces and air conditioning unit. They were professional, courteous and very fair in their pricing. I would gladly recommend TwinTech to anyone needing work done. I can be contacted at 905-626-XXXX.

by Blair N. - Toronto on Twintech Heating and Cooling

My Fiancé and I have relied on Twintech Heating and Cooling now for the better part of the last 10 years. In that time, Greg has installed a furnace, an air conditioner, and a heat-pump at our residence in Toronto. In each instance Greg and his team were a pleasure to deal with. They were courteous and professional throughout the whole process and the quality of their work is first rate. Our experiences have always been extremely positive and we have referred his services numerous times to our friends and family. Without hesitation, I would recommend Greg and TwinTech Heating and Cooling to anyone looking to service or replace their existing heat/AC equipment

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See What Our Customers Are Saying:

by Robert Rogers on Twintech Heating and Cooling

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.

by Robert Mizuno on Twintech Heating and Cooling

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!

by Ruth on Twintech Heating and Cooling

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!

by Anna Chin on Twintech Heating and Cooling

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!

by Connor Agnew on Twintech Heating and Cooling

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.

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