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My Furnace is Cycling Frequently
Posted On: March 18, 2025
If your furnace is cycling on and off more frequently than usual (called short cycling), it’s usually a sign that something’s wrong. Let’s troubleshoot some common causes:
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Dirty Air Filter
A clogged filter restricts airflow, causing the furnace to overheat and shut off quickly to prevent damage.
Fix: Check and replace your air filter if it looks dirty or hasn’t been replaced in the last 1-3 months.
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Thermostat Issues
A malfunctioning thermostat, poor placement (like near a heat source), or incorrect settings can cause rapid cycling.
Fix: Ensure the thermostat is set to "Heat" and "Auto" (not "On"). If the thermostat is old, consider replacing it.
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Flame Sensor is Dirty or Faulty
The flame sensor detects if the burners are lit. If it’s dirty or failing, the furnace may shut off too soon.
Fix: Turn off power, remove the flame sensor, and clean it gently with steel wool or a fine brush.
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Overheating Furnace
If the furnace overheats, safety switches shut it down early. This could be from poor airflow, blocked vents, or mechanical issues.
Fix: Ensure all vents are open and unblocked. If the issue persists, a professional should inspect the system.
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Oversized Furnace
If your furnace is too powerful for your home, it may heat rooms too fast and shut off repeatedly.
Fix: Unfortunately, this requires a more permanent solution — consulting an HVAC pro for resizing or adjustments.
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Faulty Limit Switch or Blower Motor
A failing limit switch or blower motor may cause irregular cycling.
Fix: A professional diagnosis is best here — parts may need replacing.
If none of these fixes work, it’s worth calling an HVAC technician to prevent damage to your furnace or higher energy bills.
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See What Our Customers Are Saying:
Jul 3, 2022
Great service and great people to deal with, from sales to installer. I highly recommend this company.
Apr 28, 2022
Twintech replaced our aging furnace and air conditioner recently. I highly recommend this company. Their quote was competitive, they were on time and respectful of our home and extremely professional. From the salesman to the installers and the owner who followed up afterward to ensure we were satisfied, we are very pleased with the service. We are looking forward to working with this company for all of our HVAC needs for the years to come. Excellent workmanship and service!
Apr 28, 2022
We wanted to get our AC replaced as it was 22-years old and added to this our furnace was costing more and more to repair. So, we decided to get both the furnace and AC replaced.
After going through a few quotes and product reviews we decided to go with Twintech. The three-men crew arrived early in the morning, wasted no time and got to work right away. By 2:00 pm, they were all done. Ive found their work to be top notch and they were completely professional. I had all my questions answered to my satisfaction both during the progress of their work and at end.
I have pleasure in recommending Twintech to anyone who is looking to get their furnace or Ac replaced
Nathan S.
Apr 28, 2022
Our air conditioner died On a Saturday and within hours Dave came out to take a look and discuss replacement/repair options.
The new air conditioner was installed on the Wednesday. The new unit was installed quickly. The installers were friendly and cleaned up afterwards.
We noticed a slight leak around the furnace that night and they came out the next day and fixed the issue. It has been working great and is quieter than our previous unit.
Very satisfied and would highly recommend TwinTech.
Apr 28, 2022
I contacted TwinTech to replace my 20-year old A/C. Dave, their service rep, promptly replied and was at my home within 2 hours. He was friendly and knowledgeable and didn't try to upgrade or oversell their A/C units but suggested the best fit for my small 1000 feet bungalow. Although this was during a heatwave and very busy, they were able to fit me in 2 days later. The TwinTech crew installed a 1.5 ton Ducane A/C unit that is now running smoothly while maintaining a constant cooling temperature. The crew were very courteous, professional and efficient and I will definitely recommend TwinTech to family and friends. I much appreciated your great service.
Nancy M., Oshawa
Apr 28, 2022
We had a great experience. The guys who installed our a/c did a nice job. Cleaned up.
Apr 28, 2022
excellent crew, fast and efficient! Would call them again when I need a new furnace.
Apr 28, 2022
Professional, courteous and efficient, dont need to say more than that! Use them you will not regret it.
Apr 28, 2022
TwinTech was a pleasure to deal with from the estimate through installation. We replaced a 28 year old a/c unit with one recommended by TwinTech's sales representative Dave who took the time to go over the product with us and answer any questions. The warranty is for 10 years parts and labour and they will complete the registration for you. Installation was by Greg (owner) and Mitch and Spencer who were quick and efficient and left everything clean and tidy.
Apr 28, 2022
Very professional, from the sales consultation and inspection to the final installation. Met every expectations we had for the job. A local business with great client support. We highly recommend. Twintech is a blue chip! Thanks!
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