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My Furnace Suddenly Stopped Working
Posted On: February 11, 2025
If your furnace suddenly stopped working, here are some steps to troubleshoot the issue before calling a professional:
1. Check the Thermostat
- Ensure it’s set to "Heat" mode.
- Increase the temperature a few degrees to see if the furnace kicks on.
- Replace the thermostat batteries if it runs on them.
2. Inspect the Power Supply
- Check if the furnace switch (typically on the side of the unit) is turned on.
- Make sure the circuit breaker hasn’t tripped; reset it if necessary.
3. Examine the Air Filter
- A clogged air filter can cause overheating and shut down the furnace. Replace a dirty filter and try restarting the system.
4. Check the Pilot Light (for Gas Furnaces)
- If you have an older gas furnace, the pilot light may have gone out and needs to be relit.
- If you smell gas, turn off the furnace immediately and contact a professional.
5. Inspect the Furnace Door
- Many furnaces have a safety switch that prevents operation if the access panel is not securely closed.
6. Look at the Condensate Drain (for High-Efficiency Furnaces)
- If the drain line is clogged, the furnace may shut down. Try clearing it out.
7. Reset the Furnace
- Turn off the furnace at the breaker, wait 30 seconds, then turn it back on.
If these steps don’t resolve the issue, it may require professional service.
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See What Our Customers Are Saying:
Jan 1, 2015
Dave was great in helping me get the proper units for my property, as well as getting them installed. The installers arrived when they said they would, and completed the project on time, and professionally. If I needed another furnace, I would use Dave again.
Jan 1, 2015
I have known Greg and Grant Dainty for many years and have used their company for my house and business. I recommended them also for my parents and sister and they all have been very satisfied with the quality of work for a reasonable price. I just recently had them install a new HVAC system in an older house and was very pleased with their work. Craig in Pickering. After meeting with various heating and air conditioning contractors I was referred to Twin Tech Heating and Cooling through a family member. Greg and Grant arrived at my home and provided me with an estimate and a plan as to how they were going to remove and replace my furnace and air conditioner. On the day of install Greg and Grant arrived at my home on time and were very professional and extremely courteous as to any questions or concerns that I had. The removal and install was truly professional and the attention to detail was exactly what I was looking for. Ive seen many installs from other contractors and I couldnt be any happier to have had such a clean looking install. The sheet metal work, ducting and venting all look fantastic. Upon completion Greg and Grant left me feeling extremely happy and very fortunate of a job well done. Thanks again Twin Tech!!
Jan 1, 2015
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.
Jan 1, 2015
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.
Jan 1, 2015
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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