A furnace “short cycles†when it turns off before reaching the desired temperature. This means that if your thermostat is set to 72 degrees, the furnace may shut down at 65 or 68 degrees, but will never reach 72 degrees. Short cycling can also be used to describe a furnace that turns on and off too often. Most furnaces will turn on and run for several minutes before reaching the desired temperature and shutting back down. This can happen anywhere from three to eight times an hour, depending on the condition of the furnace and the outdoor temperatures. If it cycles too frequently or only runs for a minute or two before turning off, there may be a problem with the furnace.
Furnaces have built-in safety systems that prevent dangerous situations like fires, carbon monoxide leaks, or gas leaks. The most likely cause of short cycling is the fan limiter, which prevents fires and furnace damage by shutting the system down if the heat exchanger becomes too hot. The flue limiter can also shut the system down if the flue is clogged to prevent combustion gas accumulations, and the flame sensor can shut the system down if the igniter has failed.
Several conditions can cause furnace shutdowns, including:
Though it may be inconvenient when your furnace shuts down for something minor, like a clogged air filter, such safety features prevent harm to your family and your home.
If your furnace is short cycling, talk to our team at GAC Services. We can quickly repair most problems that would cause a furnace to short cycle, and we offer furnace repair services throughout Maryland, including Bethesda, Gaithersburg, and the surrounding areas. We can also prevent problems from happening in the first place with our annual furnace maintenance services, which include preventative maintenance like changing the air filter, cleaning the flame sensor, and testing the igniter.
Contact us online to schedule furnace services near Gaithersburg today!
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