Why Is My Furnace Short Cycling?

Have you ever noticed your furnace kicking on, blowing a hot breeze for several minutes and then turning off? This is called short cycling. In other words, the furnace turns off before reaching your desired temperature.
For instance, you could set your thermostat to 72 degrees, but the furnace keeps shutting off at 65 degrees. Short cycling is not only confusing, but can indicate it’s time to get a new furnace.
Reasons Why Your Furnace Is Short Cycling
You might be wondering why your furnace is short cycling. There are several reasons why this happens, including:
- Faulty thermostat
- Clogged air filter
- Overheating
- Dirty flame sensor
- Oversized furnace
- Faulty limit switch
Let’s go over each of these in more detail.
Faulty Thermostat
If your furnace is not kicking on when the temperature drops, check the thermostat. A malfunctioning thermostat sends incorrect signals to your furnace. … Read Full Post »