What Causes Short-Cycling in Furnaces?


If your furnace starts up, runs for a short period of time, and then shuts back off again, you may have a problem with short cycling. Short cycling puts unnecessary wear and tear on your furnace and can be caused by a variety of issues. Keep reading to learn more about the causes of your short cycling furnace and what you can do to fix the problem.

What are some common causes of short cycling in furnaces?

A furnace that short cycles turns on and off more frequently than it should. There are several reasons why a furnace might short cycle, but the most common problem is the thermostat.

If your furnace is short cycling, the first thing to do is check the thermostat. Make sure that it’s set to “heat” and that the temperature is set high enough to turn on the furnace. For example, if your thermostat is set too low, it may tell the furnace to turn on when it doesn’t need to. If it’s set correctly and the furnace continues to short cycle, there are several other common causes:

A dirty filter: if your furnace filter is dirty, it can cause the system to work harder than it should. This can lead to short cycling and other problems like poor air quality and higher energy bills.

A clogged nozzle: A clogged nozzle can also cause your furnace to short cycle. This is because a clogged nozzle can prevent the furnace from igniting properly, which will cause it to turn on and off more frequently.

Blocked air vents: There are several reasons why air vents might become blocked. One reason is that debris, such as dirt, leaves, or snow, can accumulate in the vents. Another reason is that animals such as squirrels or raccoons may build nests in the vents. A third reason is that ice can form inside the vents during cold weather.

How can improper installation cause a furnace to short cycle?

When a furnace short cycles, it means that the furnace is going on and off too frequently. Another common reason for this is improper installation. If your furnace isn’t installed correctly, it may not be able to handle the amount of heat that it needs to generate to keep your home warm. As a result, the furnace will turn on and off repeatedly to reach the desired temperature.

You can do a few things to help prevent the improper installation from causing short cycling in your furnace. The first is to hire a qualified contractor who knows how to install furnaces properly. You should also ensure that all of your furnace’s components are compatible with each other and that they are all sized correctly for your home. Finally, be sure to have regular maintenance appointments with your HVAC technician to address any potential problems before they cause damage or lead to short cycling.

What if there’s a problem with the blower motor?

The blower motor on a furnace is responsible for moving heated air throughout the home. It’s an essential component of the heating system and plays a key role in keeping the home comfortable during winter. The blower motor is powered by electricity and is controlled by the furnace thermostat. When the thermostat signals the furnace to turn on, the blower motor begins blowing heated air through the ductwork. It runs until the thermostat signals the furnace to turn off.

If the blower motor is malfunctioning, it can cause the furnace to turn on and off repeatedly. This can be frustrating, as it can cause the furnace not to heat your home properly. It can also increase your energy bills, as the furnace will be running much more than it should. If you are experiencing this issue, it’s important to have a professional technician take a look at the blower motor to see if it needs to be replaced.

About Author

LaDonna Dennis

LaDonna Dennis is the founder and creator of Mom Blog Society. She wears many hats. She is a Homemaker*Blogger*Crafter*Reader*Pinner*Friend*Animal Lover* Former writer of Frost Illustrated and, Cancer...SURVIVOR! LaDonna is happily married to the love of her life, the mother of 3 grown children and "Grams" to 3 grandchildren. She adores animals and has four furbabies: Makia ( a German Shepherd, whose mission in life is to be her attached to her hip) and Hachie, (an OCD Alaskan Malamute, and Akia (An Alaskan Malamute) who is just sweet as can be. And Sassy, a four-month-old German Shepherd who has quickly stolen her heart and become the most precious fur baby of all times. Aside from the humans in her life, LaDonna's fur babies are her world.

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