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Furnace Is Not Heating Up

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Furnace Is Not Heating Up

Posted On: October 24, 2024

Furnace Is Not Heating Up

If your furnace is not heating up, several potential issues could be causing the problem. Here are some common reasons and troubleshooting steps you can take:


1. Thermostat Issues

  • Check settings: Ensure the thermostat is set to "heat" and the temperature is set higher than the current room temperature.
  • Replace batteries: If your thermostat uses batteries, try replacing them to ensure it’s working properly.
  • Calibration: Sometimes thermostats need recalibration if they aren’t reading the correct temperature.

2. Clogged or Dirty Air Filters

  • Dirty air filters can restrict airflow, causing your furnace to overheat and shut down as a safety measure. Replace or clean the filters regularly to ensure proper airflow.

3. Tripped Circuit Breaker

  • Your furnace may not be receiving power due to a tripped circuit breaker. Check your home's electrical panel and reset the breaker if necessary.

4. Pilot Light or Ignition Issues

  • For gas furnaces: If your pilot light is out, you’ll need to relight it. If your furnace has electronic ignition, it may need troubleshooting or professional repair.
  • Check for gas supply: Ensure your gas valve is open, and your furnace is receiving a supply of gas.

5. Blower Motor Problems

  • If the blower motor isn’t working, the furnace won’t distribute heat. Listen for any unusual sounds, which could indicate a motor problem, and call a technician if necessary.

6. Dirty Flame Sensor

  • A dirty flame sensor can prevent your furnace from staying lit. Cleaning or replacing the flame sensor can resolve this issue.

7. Blocked Vents

  • Ensure all supply and return vents are open and unobstructed to allow proper airflow. Blocked vents can cause overheating and system failure.

8. Faulty Limit Switch

  • The limit switch prevents your furnace from overheating. If it’s malfunctioning, the furnace may not heat up properly. A technician may need to replace the switch.

9. Gas Valve Issues

  • If the gas valve is faulty, it could prevent the furnace from receiving the fuel needed to heat your home. This issue requires professional diagnosis and repair.

If the basic troubleshooting steps don’t solve the problem, it’s best to contact a professional HVAC technician to diagnose and fix the issue safely.



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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 installedÂ…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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