How to Perform Annual Furnace Maintenance

The basic maintenance of furnaces is straightforward and does not take a lot of time. The primary reason for HVAC failure is a lack of maintenance. Insufficient maintenance can make the system run poorly, even although it will continue to function, it will costs you more in the end. There are many ways you can take care of yourself to ensure that your furnace stays operating. The annual maintenance can help reduce your expenses and keep your furnace in top condition. This is an illustration of a checklist of items to be checked or cleaned in an 90% furnace

overall cleanliness of the unit Change an Air Filter Checking and Cleaning from the Drain Lines and Cleaning the Burner Compartment of the Blower and Cleaning of the Flame Sensor Drag on the Draft Motor, o Temperature Increase across the furnace the Hot Surface Igniter Inspection Verify the proper functioning of the Furnace Security

The list is arranged from the easiest to more complex. Therefore, if you don’t feel confident enough to dismantle the burners, or to locate and unplug wiring, it is still possible to help yourself by completing the three first items. In order to be completed a full annual maintenance, all 10 components must be completed. Anyone with some mechanical skills, and following the owner’s manual, should be able to finish the task.

Safety First!

Be sure to read and understand all safety warnings and precautions prior to working in any kind of heating system. It is recommended to read the entire owner’s manual before working on the furnace.


If you don’t follow this advice, it can result in injury to a person or even death. Switch off the electrical power to your furnace prior to taking out the access doors to repair or carry out maintenance.


In the event of a mishap, failing to adhere to this warning could result in injury to a person. Be very careful when handling components or entering the furnace. Wear safety gloves, glasses and the appropriate protective clothing.

Let’s get started.

  1. Overall cleanliness of the unit This is an easy one to complete, but it isn’t ever accomplished. The majority of furnaces run on negative pressure to draw into combustion air. There aren’t any filters in place to remove the air. Thus, any dirt or lint that’s in the air has the potential to enter the furnace to be gathered in the furnace. Lint can be a source of fire. If there were ever an ignition source that rolled out this could ignite the lint, causing the fire to spread. Make sure that the furnace’s power is turned off. Then, remove the panel and then using a vacuum and a moist rag, clean the dust, lint and dirt from the inside. Clean and vacuum the exterior of the furnace too. Also clean the surrounding area (piping and ductwork as well!) Replace the panel, and switch the power off.
  2. Removing an Air Filter principal function furnace cleaning service of the filtering system is to cleanse the air inside your home, as it moves through the furnace to benefit you and your familymembers, and to keep the furnace clean. Maintaining the airways of your furnace clear and clean ensures that it is efficient. Insufficient air flow caused by an unclean filter will not allow all the heat produced to escape the furnace and provide heat to your home. This heat accumulates inside the furnace, and may result in an overheat situation that triggers the safety switch for high limits which will prevent the furnace to start again until it is cool enough. This condition is known as “short cycling.”

Therefore, since the furnace doesn’t have the capacity to pump all of the heat into the areas where it is needed, it’s wasted energy, which will cost you more. The quantity and type of particles present in the air in your home will depend on the number of pets and people reside in the home and the kinds of activities that take place. Asthma sufferers and those with allergies must be particularly vigilant about maintaining the cleanliness of their home’s air filters. Before you remove the old filter, you must shut off the power to your furnace to ensure your security. Choose one that is suitable for the needs of your family and change it frequently. Be aware that the more efficient your filter is, the more frequently it will require replacement.

  1. Inspection and Cleaning Of the Drain Lines These drain lines could back up , causing your furnace to turn off down. If drain lines become blocked and leak out of the furnace, they can be messy and create the possibility of slipping. If they leak within the furnace, it could damage the metal , corrosion. The water that leaks is usually acidic and may cause extensive damage.

Since this is a high-efficiency furnace, it utilizes a second heat exchanger. The second condensing heat exchanger is able to release more heat via condensation. Condensate drain connections are required to store the condensate from the combustion of gases to be disposed into the ac coil cleaning. If your furnace is equipped with an evaporator that is used for summer cooling, there is a drain pan that has a drain line that drains condensate from the home drain system too. Be sure to turn off the power supply prior to you start. With the help of the owners manual, you will be able to locate the drain lines as well as their positions.