Why Does My Heating Keep Turning Off Prematurely?

Have you ever found yourself asking, “Why does my heating keep turning off prematurely?” If so, you’re not alone. This common issue, often referred to as short cycling, can be incredibly frustrating, especially during the colder months. But don’t worry; we’re here to help you understand why this happens and how to fix it. 

Understanding Short Cycling

Short cycling is a term used to describe a situation where your heating system turns on and off too frequently. This not only leads to a less comfortable home but can also increase your energy bills and put unnecessary strain on your heating system. 

  1. Causes of Short Cycling

There are several reasons why your heating might be short-cycling. Let’s explore some of the most common ones: 

  1. Thermostat Issues: Your thermostat is the control centre of your heating system. If it’s not working correctly, it could be sending incorrect signals to your system, causing it to turn off prematurely.
  2. Oversized Heating System: If your heating system is too large for your home, it can heat your home too quickly, causing it to turn off before it should. This can lead to frequent on-and-off cycles.
  3. Dirty or Clogged Filters: Dirty or clogged filters can restrict airflow, causing your system to overheat and shut down prematurely to prevent damage.
  4. Faulty Heat Exchanger: A faulty heat exchanger can cause your system to overheat, triggering safety mechanisms that shut down your system.

How to Fix Short Cycling?

Now that we understand the causes let’s look at some solutions: 

  1. Check Your Thermostat: Ensure your thermostat is set correctly and is functioning properly. If you’re unsure, consider calling a professional to take a look.
  2. Right-Size Your Heating System: If your system is too large for your home, consider downsizing. A professional can help you determine the right size for your home.
  3. Clean or Replace Your Filters: Regularly cleaning or replacing your filters can help prevent short cycling. It’s generally recommended to do this every 1-3 months, depending on usage.
  4. Inspect Your Heat Exchanger: If you suspect a faulty heat exchanger, it’s best to call a professional. This is not something you should attempt to fix yourself.


Understanding why does my heating keeps turning off prematurely can help you take the necessary steps to fix the issue. Whether it’s checking your thermostat, cleaning your filters, or calling a professional, you now have the knowledge to tackle this problem head-on. 

Remember, regular maintenance is key to preventing issues like short cycling. By taking care of your heating system, you can ensure it takes care of you.