Find Limit Switch Furnace Repair Problems & Solutions

Are you having Common Furnace Problems with you Limit Switch?

If you need furnace repair work performed because your furnace has stopped working but are not sure exactly what the root of the problem is, this article may just be able to help.  

Often times when your furnace stops working or is not producing enough heat it only requires a simple furnace fix like replacing the limit switch, electric ignition or pilot control for the pilot light.  These problems can also usually be prevented along with other HVAC issues by having a water heater, air conditioning, and furnace maintenance performed on a regular basis.

Technological changes have brought some wonderful advancement especially in protecting HVAC systems such as gas furnaces against certain risks they encounter while they are running. 

To learn some troubleshooting tips for your furnace’s limit switch, be sure to watch the following video:

One safety device they use and that plays a major part in ensuring the process of heating the cooling system runs smoothly is the furnace limit switch. This article will try and describe exactly what this device is and what it does. 

It will also describe the common problems you may encounter with your furnaces limit switch and solutions on how to repair those problems.

How Your Furnace Limit Switch Works

If you are keen to listen to a high-efficiency forced-air heating system on a cold day, you may have wondered why the burner starts roaring just a few minutes before the blower fan comes out. You should clearly understand that this does not mean you are sending hot air up the chimney but rather it means that the limit switch of your furnace is working well.

These heating systems usually burn fuels such as natural gas, oil and also have blower motor fans that are able to send air throughout the house via a system of supply ducts. Rather than heat up the air that circulates, the burner actually warms the metal heat exchanger that then warms the air inside it. Then what follows is that the now warmed air passing via the heat exchanger is able to circulate through the house.

One thing you should also know is that if the blower came out at the same time as the burner, it will be able to pump cold air through the house first. This is where now the limit switch comes in. it includes a sensor in the heat exchanger that is able to determine and verify whether or not the air is warm enough to be pumped for circulation. Once the air gets to the required temperatures, the limit switch automatically turns on the blower. 

In the same way, the limit switch will automatically turn off if the air temperature falls below the lower limit. Another very vital role the limit switch also plays is that it also shuts off when the air temperature rises beyond the upper limit.

You should know that when the heating process begins, it normally takes a bit of time to heat up the burners. In this case, the air handler needs to wait to turn on for it to be able to heat up all the air in the rooms.

A furnace limit switch is a device located under your furnace supply plenum. It is able to read the temperature of the plenum and as well wait until the ideal warmth is acquired. Once the plenum gets to a certain temperature level, it is able to send a signal to the air handler which now begins to run and deliver warm air quality in your home.

In addition, a limit switch also acts as a safety device for your furnace. In case the air in the plenum gets overheated, it will automatically turn off the supply of gas and your burners will soon start cooling and hence be able to ensure that the furnace and the entire system are prevented from overheating.

Now that you know exactly what you furnaces limit switch does, let’s take a look at some common problems you may encounter with the limit switch.

Common Problems With Furnace Limit Switches

What will happen if suddenly the furnace limit switch starts malfunctioning?

Like any other equipment, your furnace limit switch will encounter problems while being used. These issues are accrued from the airflow issues in your system. 

In case your furnaces lack proper airflow, for instance, if it is operating with a dirty filter, your heat exchanger will constantly overheat and put your limit switch through a rough process of wear and tear. This will lead to your furnace limit switch malfunctioning.

No matter the cause of the air quality problems with your furnace switch, a switch that is not working properly will result in issues with your system. For instance, the air handler may turn on during the heating cycle of your home and the reason will be because the limit switch is not successfully sending it the right signals. 

Another problem that may arise due to a malfunctioning limit switch is that your furnace may overheat and not shut down at all because your limit switch is not turning off the gas to your burners as it should.

How To Properly Maintain Your Limit Switch

One ultimate way of ensuring that your limit switch is in good shape is scheduling a furnace maintenance tune-up each year with your local HVAC contractor. During the tune-up process, the contractor will be able to properly inspect your limit switch and also take care of airflow issues with your system which may cause a breakdown of your limit switch system.

Additionally, it is very important to keep up with your air filter changes. This will be of great help in ensuring that your system has proper airflow and this will prevent the issues we discussed earlier in this article.

The major function of a furnace limit switch is to send a signal to the heating system and command the turn on or off switch. One thing every homeowner should know is that it is possible to reset the switch right at home by following just a few simple steps. 

This ensures that you are able to create a friendly environment in your house without much of a struggle. The limit switch is able to guarantee you safety for it will not at one time allow cold air to be blown into the house as well as excessively heated air to be blown in the house as well. 

This just highlights how important a furnace limit switch can be and therefore one should not overlook the vital roles it plays in ensuring your living space is friendly and convenient.

Before trying anything like resetting the limit switch on your own, it is important to seek consultations from your HVAC contractor and as well read through the furnace instruction manual. This is important because you would not like to compromise the safety of you and your family members.

Now that you know some common problems and solutions that come with owning a furnace, you should be able to handle any future heating problems you may encounter.  If you are still in search of more information regarding other common heating and air conditioning problems or how to find the best HVAC contractors near you, be sure to read the following related articles. 

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