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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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Aug 16, 2022
Very pleased with the installation of our new furnace and A/C unit. From quotation stage to the completion of the job Twintech was very professional.
Thank you for a job well done.
Aug 15, 2022
My old water heater quit on me. I called TwinTech. In less than 4 days, I had my new water heater installed and the old one taken away. The whole process was quick, easy, pleasant, and well done. This is the third time I've dealt with TwinTech and I've been satisfied each time.
Aug 14, 2022
I had them replace my furnace last year. When it came time for the air conditioner this year, I did not hesitate to call Twintech again. I will also have them perform regular maintenance on them.
Aug 13, 2022
We required a new HVAC replacement after running the old
system for 18 years.
Dave understood our requirements and gave us a quote that
covered all the necessary items.
Installation was fast and very tidy. Everything works as
it should. Our thanks to Greg, Mitch and others for their
excellent work. Recommend this family owned business to
anyone else, considering HVAC or other work.
Aug 12, 2022
I needed a new furnace and A/C to replace my 21 yr. old units, and went to the internet to view potential companies in May, I received 3 quotes,
and chose Twintech based on their salesman Dave who was very detailed and covered off everything on what Twintech was all about,
an extremely dedicated company with so many years of experience, and after reading the on line reviews I was sold on Twintech, who did not disappoint as the installation team were top notch with Greg leading,
I would highly recommend this company without any doubts, in my books they are first class all the way. Our new Amana furnace and A/C are working perfectly !
Aug 11, 2022
Flawless transaction. They did exactly what they promised, showed-up on time, cleaned-up, and were highly professional. Highly recommended.
Aug 10, 2022
Salesperson and 2 man installation team were all professional and
knew their stuff. All three were friendly and helpful, answering all
my questions. The quality of their work demonstrated their experience
and expertise in their field.
Aug 9, 2022
A dear late cousin of mine recommended this company and I have been happy with the service.
Aug 8, 2022
We are very pleased with the work done by Twintech. They were very professional from start to finish. Dave came to our home and gave us a very competitive quote for new high efficiency furnace and air conditioner. The installers were very courteous and professional. We would highly recommend them.
Aug 7, 2022
Great experience getting an old furnace replaced.
Sales Guy (Dave) was great - honest, responsive, and friendly.
The work itself was done quickly and we are very happy with the outcome, thank you! We recommend TwinTech!
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