Furnace Repair Mississauga

Why Does My Furnace Keep Shutting Off

Why Does My Furnace Keep Shutting Off?

Many of us have experienced their furnaces quickly shut off as soon as you turn them on. This is a major problem for some of us and leaves us with the question of why does my furnace keep shutting off. Don’t worry, we got you covered. 

In case your furnace keeps shutting down or rather short-cycling, this could lead to your expensive heating bills in the long run. Down below we have provided you with the different causes that lead to the furnace shutting down from time to time. 

We have also provided you with methods on how to fix the short-cycling.  The causes as to why do my furnace keeps shutting off are as follows. 

The Air Filter in the Furnace is Clogged 

In case your furnace keeps shutting down, the first place you must check is the air filters to check whether they are clogged. This is one of the easiest and cheapest problems to solve. Clogged and dirty air filters in the furnace tend to obstruct the airflow towards the heat exchanger. 

If the heat exchanger present in your furnace becomes too hot due to airflow restriction, a certain safety mechanism present in the furnace will shut off your furnace in order to protect its components. This is overall a good thing but it will not favor you, especially when the outside temperature is around -20 and it’s very cold. 

It is very easy to fix a clogged filter. Firstly, you should turn off your furnace and remove the air filters. Check whether the air filters are reusable or disposable filters. If the filters present in your furnace are disposable ones, you should dispose of them and buy new ones. 

You can get new filters at the local store near your location. Reusable air filters tend to be more expensive as opposed to disposable ones. This is because the reusable filters are manufactured in a way that they are long-lasting and are of a higher quality. Although they are slightly hard to clean. 

Depending on the type of reusable filter, you can clean them by vacuum up the air filters in order to remove debris and dirt or gently rinse with clean water. For your furnace to properly function, you should be able to check the air filters after a month or so. 

Keep the Vents Open

This is also another reason why does my furnace keep shutting off. You should be aware that the air filters are not the only cause of airflow restriction to the furnace’s heat exchanger, closed vents are another reason. 

Even though sometimes it is better than when your place is extremely hot, you can close some of the vents but not all of them. This is to allow for some of the air to reach the heat exchanger, for proper furnace functioning. 

The Thermostat is not Properly Functioning 

In case there is no problem with the air filters present in your furnace, it is time to check the thermostat. The problem might be the thermostat is not properly functioning and might cause the furnace to keep shutting down. 

Firstly, you should ensure that the thermostat is on and reads heat. You should then ensure that the temperature in the thermostat is programmed properly. This might be the reason why does my furnace keep shutting off. 

Someone might have adjusted the thermostat to a lower temperature and never changed the temperature back. In case all the thermostat settings are in order, you can invite a partner to assist you in checking whether the thermostat is in communication with your furnace. 

If the thermostat is working properly, whenever you change the temperatures from high to low there must be a certain sound heard. This sound could mean that there is a problem with the furnace. In case there is no sound heard, then there must be a major problem with the thermostat. 

You should call a professional to take a look at it. Another important consideration is where to place the thermostat. In case you place the thermostat near a source of heat or in the sunlight, it will read warm temperatures and finally turn your furnace off. 

The Furnace’s Flame Sensor is Covered with Soot 

In case your flame sensor present in the furnace is covered by soot or corroded, then this might lead to the furnace shutting down from time to time. When the furnace is operating in the normal way, the sensor tends to detect flames and if there isn’t, turns off the gas valve. 

This ensures that your place does not fill up with dangerous gas fumes that have deadly consequences. The flame sensor present in the furnace does its work properly and efficiently in keeping you and your family warm and safe. 

Although, if the sensor is covered in soot and is corroded, it becomes very difficult for it to sense any flame, even when your furnace is running and cuts off the supply at the gas valve. 

As you well know, there can’t be heat when the gas supply is cut short, hence this shuts down your furnace from time to time. In case you experience such a problem, you should schedule a call with a professional to solve the issue. 

The Furnace is Large  

This is another reason why your furnace keeps shutting off. When you acquire a brand new furnace for your place, it is very important that it is sized properly for your current place, otherwise, you will experience major problems. 

If the furnace is large for your place, it tends to quickly heat the place and since its task is complete, the thermostat quickly shuts down the furnace. 

The place quickly cools down without consistent heating and the procedure is repeated once more causing the furnace to shut down from time to time. The only method to fix such a problem is to get another properly sized furnace for your place. 

Proper Furnace Maintenance 

As of now, you are aware of the reasons why does my furnace keep shutting off and how you can deal with the situation. It is very important that you maintain your furnace regularly and ensure that it communicates properly with your thermostat present at your place, for you to live peacefully and comfortably.