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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 3, 2020
Reasonable price and the workmanship was prompt and timely and the employees were great to deal with.
May 2, 2020
The sales process was friendly, informative, and very consultative. They worked hard to earn our business by taking a careful look around our home to assess our needs, providing a lot of information about the product, and answering all our questions and finding the right solution for our home at a competitive price. They prepared us very well for what to expect on installation day, and the installation went very smoothly - no surprises, all very professional! They gave us a call after installation to ensure we were happy with the work. We're very happy that we chose to work with TwinTech to get our new furnace.
May 1, 2020
Twintech promptly responded to request for quotation. They were thorough and helpful in explaining options. The quote was very competitive. Installation of new furnace was very professionally completed. Excellent work.
Jan 17, 2020
When our old oil furnace finally broke down we decided it was time to finally convert to natural gas and finally install central air conditioning at the same time. Knowing it was going to be a significant investment for us, we wanted to make the right choice. Twintech came highly recommended by a friend and we were not disappointed. From the first contact with the salesperson, until the final touches on the installation, we were so pleased with their service. Everyone from the company was so friendly, efficient and a pleasure to deal with. Best of all, the cost was very competitive. We would certainly recommend Twintech to anyone requiring HVAC work in their home.
Jan 15, 2020
Mitch from Twintech came out for our annual furnace inspection. We found him to be friendly, conscientious & he left the work area clean. We were also very impressed with the thoroughness of the job he did. This is the 2nd job weve had Twintech do for us & have been very happy with the results for each. We highly recommend this company. Thank you, Mitch, Dave & Greg.
Jan 14, 2020
Work was done on schedule, professionally, according to quote and with minimal inconvenience to building users. Very happy with the end result. The only area for improvement from my experience - need more timely quoting process.
Jan 13, 2020
The team was great! Very knowledgeable, professional and extremely helpful. A few days after install the unit didnt seem to be working, user error, but within minutes of contacting them..on a Saturday.. a tech was on the phone troubleshooting with us. I highly recommend Twintech for your cooling or heating needs. They stand by their products and a pleasure to deal with.
Jan 11, 2020
During the hottest week in the summer our old A/C decided to call it quits. I called Twintech Heating & Cooling after receiving a referral from a family member; came highly rated for being an honest, family-run business, who appreciates their customers. Dave was able to accommodate my hectic schedule and book a late evening appointment to walk through the specifics. Greg and Mitch arrived exactly on time a few days later, were very polite and friendly, and within a couple of hours had a new unit up and running. I also received a follow-up call to ensure we were happy with the Amana.
Jan 10, 2020
They were on time and very professional. I'm so glad I decided to go with Twintech, thanks!
Aug 20, 2019
Timely and appreciated - this was during the hottest days this year when our Air and Furnace way.
Efficient. Professional. No BS or overselling. What was promised, was delivered at a cost-effective price point.
Down to earth.
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