When you set your heater’s thermostat to “Auto” mode, the system will turn on and off periodically to ensure your home maintains your preferred temperature. However, it isn’t typical for a heater to short cycle, which is turning on and off too quickly to actually heat your living space.
What causes a furnace to short cycle? And why is it a problem?
As reliable providers of heating services in Xenia, OH, Butler Heating, Air Conditioning & Plumbing knows how frustrating a malfunctioning heater can be for any household. Our guide below explores the most common causes of this heating problem.
What Is Furnace Short Cycling?
All heat pumps and furnaces perform periodic heating cycles. The process generates and distributes warm air throughout a building whenever the temperature drops. These cycles take time because the equipment must heat your space to the temperature you’ve set on the thermostat before it shuts down the operation.
When these systems short cycle, they may turn on for a minute or two and then switch off. That’s not quite enough to accommodate your thermostat temperature settings. As a result, the thermostat will read the temperature as being too low, and the equipment will soon turn back on.
This inefficient heating cycle will continue until you identify what’s causing your Xenia furnace to malfunction. In the worst-case scenario, you won’t know what causes a furnace to short cycle, and your energy bills will skyrocket. Avoiding short cycling is preferable if you want to avoid premature wear and tear on the furnace from overheating and excessive energy consumption.
Reasons Xenia Heating Systems Short Cycle
The average heating cycle for Xenia’s residential furnaces is about 15 minutes. What causes a furnace to short cycle and fail to maintain normal cycling processes? Here are the main culprits.
Dirty Air Filters
If you don’t change your filter, it will clog with debris. Filthy filters and blocked heat grates restrict airflow through the heater system, causing it to overheat and trigger the limit switch. This is a safety feature that forces the equipment to shut down when the furnace’s internal temperatures get too hot.
When the system cools down, the limit switch disengages and the furnace starts up again. However, it’s simple to prevent airflow restriction in the first place if you replace your filter at least every 90 days.
Oversized HVAC Systems
Some Xenia properties have improper furnace sizes. Installing a heater with a bigger heating capacity than the property needs will mean inconsistent temperatures. A bigger system isn’t more efficient than a smaller one.
Equipment that’s too powerful will generate a lot of heat. However, the excess may create seal leaks or cracks, allowing all that heat to escape. The system will then short cycle while it is trying to maintain a consistent temperature.
Thermostat Malfunctions
If your thermostat runs on batteries, you might need to change them to control your furnace correctly. The heater may be fully functional, but the thermostat can’t do its job without a power supply.
Knowing what causes a furnace to short cycle also means checking your thermostat’s settings. Sometimes, short cycling occurs because someone forgot to put the device into “Heat” mode.
Faulty Flame Sensors
Another safety feature in gas furnaces is the flame sensor. This component detects the presence of a flame inside the burner to combust fuel. If there is no flame, the sensor triggers the system to shut off the gas supply to prevent an unsafe buildup or leak.
Flame sensors degrade over time due to the condensation that forms during the combustion process. The moisture can corrode the component and cause short cycling. Always contact a qualified local HVAC expert to address flame sensor issues.
Blower Issues
Although problems with a furnace blower aren’t one of the top causes of short cycling, they can still cause it. This component moves heated air from the furnace through the ductwork to heat the building.
Even if the furnace turns on and generates heat, you won’t feel it if the blower malfunctions. Internal temperatures will rise quickly, causing the limit switch to turn on and shutting everything down.
Preserve Your Heating System’s Efficiency With Xenia’s Top-Rated HVAC Professionals
Knowing what causes a furnace to short cycle helps you know when to contact Butler Heating, Air Conditioning & Plumbing for prompt repairs. Deeply understanding furnace operations allows us to pinpoint precise problems and inefficiencies. We’ll resolve them swiftly for you.
Our NATE-certified technicians have years of experience providing comprehensive heating installation, repair, and maintenance services throughout Xenia, OH, and the surrounding communities. We’re available 24/7, so call today to request services!