If you're asking, "Why does my furnace keep turning off?" you're not alone. This issue, often referred to as short cycling, affects many homeowners and business owners, particularly during colder months. It can lead to discomfort, higher energy bills, and long-term damage to your system if not addressed.
At Barnard Heating and Cooling, we want to help you understand what short cycling is, what causes it, and when it's time to call a professional.
What is Short Cycling?
Short cycling happens when your furnace turns on, runs briefly, and then shuts off before reaching the set temperature. It may repeat this cycle every few minutes. This constant starting and stopping reduces your furnace’s efficiency and can wear out key components faster than normal.
Why Does My Furnace Keep Turning On and Off?
1. Dirty Air Filter
A clogged air filter restricts airflow and can cause your furnace to overheat. When this happens, the system shuts down early to prevent damage. Replacing the filter regularly, usually every one to three months, can help keep your furnace running properly.
2. Thermostat Problems
A faulty thermostat or one installed in a poor location can send incorrect signals to your furnace. For example, if it’s placed near a heat vent or in direct sunlight, it may think the room is warmer than it actually is and shut the system off too soon.
3. Furnace Is Too Large
An oversized furnace will heat your space quickly but unevenly. It may shut off after a few minutes and then turn back on soon after. This wastes energy and also puts extra strain on the system. Over time, this extra strain can shorten your furnace's expected lifespan. A professional can determine if your furnace is the right size for your home or building.
4. Flame Sensor Issues
The flame sensor is a safety feature that makes sure your gas furnace’s burners are operating correctly. If the sensor is dirty or malfunctioning, it can shut down the system to prevent a hazard. This is a common issue and typically requires professional cleaning or replacement.
5. Blocked Vents or Ductwork
Blocked or closed vents reduce airflow and can cause your furnace to overheat. Check that all supply and return vents are open and free of obstructions. Damaged or leaky ductwork can also reduce system performance and should be inspected by a technician.
When To Call a Professional
If your furnace keeps turning on and off, and you’ve already checked the thermostat, filter, and vents, it’s time to contact a professional. Ignoring the problem can lead to expensive repairs or system failure. A trained technician can perform a full inspection and determine the exact cause.
Call Barnard Heating and Cooling for Trusted Furnace Repair
If you're in Nevada, Lamar, or Carthage, Missouri, Barnard Heating and Cooling is here to help. Whether your furnace is short cycling or just not heating as it used to, our experienced technicians can get your system back on track. Contact us online or call us at (417) 358-6184 to speak with a technician or schedule your service.