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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:
Apr 12, 2019
On one of the coldest days of winter, our furnace stopped working. Our regular furnace company came and told us we had a CO2 leak and shut us off. Their quote for a new furnace was way too high and they couldn't even install it on the same day. TwinTech was recommended to us by a friend. We called and spoke to Dave who was very nice and knowledgeable. Grant showed up a short time later and a new furnace was installed the same day with no troubles at all. Best of all, we received a higher-end furnace than what was offered by our previous company and at a cheaper price. I would recommend TwinTech with no hesitation at all.
Apr 11, 2019
I installed a new furnace and Air conditioner with them. The installation is of high quality and according to standards. The guys are professional and reasonably priced.. I highly recommend them.
Apr 10, 2019
Had new furnace installed and ran into some difficulties but the contractor responded in a timely and efficient manner - after further service calls were made, a reasonable resolution was found.
Apr 8, 2019
The work was done quickly efficiently neatly and professionally. Pleased with the service, information, product, and the company.
Apr 1, 2019
Great sales member named Dave came in told us some amazing items and how they would be priced installed an all. We couldnt believe it! The next day the ac was installed, that day one employee named Greg told us that our furnace was working way to hard and was causing us to use way too much gas. So two days later they came in an installed a new furnace!
Apr 1, 2019
Installation was done quickly and professionally. The new furnace is quiet and provides even heat.
Mar 3, 2019
They removed and discarded old furnace. Installed new furnace. Installed air intake pipe, that had never been installed by builder, no charge. Replaced loose hose on floor with hard pipe and rerouted it to drain, no charge. Almost 33% cheaper then quote from Enercare, which was the company we dealt with and had insurance with for 8 years. No yearly fee for cleaning/insurance, saves 300 a year. Courteous, professional, fast, and friendly. My wife and I have been recommending them to everyone we know and meet, and will continue to do so. Thanks for everything, Twintech!!!
Mar 4, 2019
This company was great to deal with. Our furnace went down and they installed a new furnace the next day with a lot of professionalism!
Feb 22, 2019
Finally! An honest company with highly knowledgeable and informative staff. Had a furnace service and found multiply errors in our system from an amateur installer. Very fair price to correct problems and will definitely use again.
Feb 16, 2019
Had to replace the heating & a/c unit in a condo apartment dwelling. this company recommended by the property manager and president of the condo building. found their workmanship and attention to details very good and very thorough. were able to resolve small problems and situations and happy to feel the heat in my unit. it's pricey, but happy was done by a very professional service. thank you.
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