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Furnace is Turning Rapidly On and Off
Posted On: December 18, 2024
When your furnace is turning on and off rapidly, a situation known as short cycling, it can cause inefficiencies, higher energy bills, and wear on your system. Several factors might be causing this issue, including:
1. Dirty Air Filter
- A clogged air filter restricts airflow, causing the furnace to overheat and shut down as a safety precaution. The furnace will attempt to restart, repeating the cycle.
- Solution: Replace or clean the air filter regularly (every 1-3 months depending on usage).
2. Thermostat Issues
- A malfunctioning thermostat or poor placement (e.g., near heat sources or drafts) can cause inaccurate temperature readings, leading to frequent cycling.
- Solution: Ensure the thermostat is functioning correctly and is located in an optimal spot away from direct sunlight, vents, or drafts. Replace the thermostat if necessary.
3. Oversized Furnace
- An oversized furnace heats the space too quickly, causing it to cycle off prematurely. This can lead to uneven heating and energy inefficiency.
- Solution: Consult a professional HVAC technician to evaluate your furnace size. If it's oversized, replacing it with a properly sized unit may be necessary.
4. Blocked or Closed Vents
- Obstructed or closed vents can disrupt airflow, causing the furnace to overheat and cycle off.
- Solution: Ensure all vents are open and free of obstructions like furniture, rugs, or curtains.
5. Faulty Flame Sensor
- The flame sensor detects whether the furnace is burning fuel. If it’s dirty or malfunctioning, the furnace might shut off prematurely.
- Solution: Clean the flame sensor gently or replace it if cleaning doesn’t solve the issue.
6. Blower Motor Problems
- A malfunctioning blower motor may fail to distribute air properly, causing overheating and short cycling.
- Solution: Have a professional inspect and repair or replace the blower motor if necessary.
7. High Limit Switch Malfunction
- The high limit switch shuts off the furnace if it overheats. If this switch is faulty or constantly tripped, it can cause short cycling.
- Solution: Consult an HVAC technician to inspect and replace the high limit switch if needed.
8. Improperly Set Furnace
- If your furnace is running on too high a setting for the size of your space, it can cause rapid cycling.
- Solution: Adjust the settings or consult a professional for recalibration.
When to Call a Professional
If these troubleshooting steps don’t resolve the issue, or if you suspect a mechanical or electrical fault, contact a licensed HVAC technician. Short cycling can lead to more severe damage over time if not addressed promptly.
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See What Our Customers Are Saying:
May 16, 2021
Appreciated a quick response to my request. Dave and Greg were very professional and made the experience seamless.
Feb 1, 2021
Very professional through the entire process. Installation and removel was done on a sloppy winter day, they put down runners on the floors and stairs and when they left, there wasn;t any sign of someone being in our house. Furnace works great as promised.
Feb 1, 2021
Dave was very pleasant to deal with and Twintech responded quickly when our furnace needed to be replaced ASAP. Installation was done on time and the crew were neat and tidy. We now have a great furnace that suits the needs of our family.
Feb 1, 2021
When your furnace kicks in over the holidays and you're not sure where to turn.. I'm so thankful that this company returned my phone call. I appreciated their transparency and clarity which allowed me to make an informed decision. With various quotes thrown at you, it can be difficult to make the right decision and trust the solutions offered by different companies. TwinTech spoke the truth and delivered on their word. Neat, timely and clean service; the peace of mind I needed during a very cold holiday season. I highly recommend them!
Feb 1, 2021
Pulling a old unit out and installing a modern heating system! Required drilling holes in the wall for the newer pipes. We went from 70% (I am willing to bet it was far less due to lack of maintenance and just old) to 96% newer . It now feels warmer and more pressure and we use to run extra heaters and feel as though they are not necessary!
Feb 1, 2021
I received three quotes before deciding to choose Twintech. Dave's prices was much more reasonable than the competitors. I most appreciated their honest recommendations. Others tried to oversell their products and services. Thank you Dave!
Feb 1, 2021
They had the best price and did a great job on the installation. Recommend them to anyone.
Feb 1, 2021
It was a amazing and professional high quality job
Friendly and very helpful representatives
Thank you for understanding my concern
And explain very well
Overall we pleased with your service
Tanks
May 15, 2020
My 19 year old furnace stopped working when the cold weather hit in November, and I was left without heat. I interviewed several companies and found TWINTECH HEATING and COOLING to be very knowledgeable, quick to respond to my inquiries and very competitively priced.
Dave provided all of the information and pricing ahead of time and set up the appointment for the installation. Greg and Mitch arrived on time to do the installation and worked quickly and efficiently to complete the job.
After the completion of the installation, Dave followed up to ensure that everything was working well and that I didn't have any concerns.
Overall, this was a low-stress and flawless experience from start to finish. I would highly recommend TWINTECH HEATING and COOLING to anyone that requires a new furnace.
May 14, 2020
Our 20 year old furnace broke down during the first cold weekend this past November and our usual HVAC company never returned our phone call. Their loss, missing out on a sale since we didn't want to spend much fixing an old furnace and our 40 year old air conditioner was also long overdue for replacement. We proceeded in obtaining three different quotes for furnace and air conditioner replacement, and proceeded with the one we received from Twintech.
Dave was friendly, knowledgable and accommodating to our schedule and provided with us with a price that fell in the middle of the three quotes that we had. We felt that the Amana furnace and air conditioner he quoted us on were the best products and value offered to us and felt most comfortable with the professionalism and reputation of Twintech.
Greg, Grant and Mitch were at our house for installation the day after we decided to proceed. The guys were friendly and informative, the job was completed efficiently and workmanship appears excellent. Our house is certainly much more comfortable with the new two-stage variable speed Amana furnace compared to the old clunker! And, we're looking forward to enjoying the new air conditioner once summer rolls around again. Thanks Twintech!
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