My Furnace Turns on for 15 Minutes Then Shuts Off Then I Tap on the Thermostat and It Starts Again

Are you lot getting used to hearing the familiar hum of your furnace merely to hear it shut off again a few minutes subsequently? Many furnaces can get into the habit of repeating this bike over and over once more. When the furnace turns on then off after a few minutes, you demand to figure out the cause then that yous tin can keep your home warm through the blustery wintertime temperatures.

A furnace that starts and shuts off over and once more is frequently described equally short cycling. At that place are many potential reasons that your furnace could be brusque cycling, and then let'due south take an in-depth look at the causes and their solutions.

Muddy or faulty flame sensor

If your furnace turns off after a few minutes, there is a expert chance it is acquired by a faulty or dirty flame sensor. This vital component is designed to keep an eye on the gas burner. When it cannot sense that burner, the furnace runs so shuts off and starts again. This could be a relatively easy gear up.

Homeowners can enlist the assistance of a professional to requite their furnace a thorough once-over, or they can clean the flame sensor themselves with a lightly abrasive pad. If cleaning it doesn't correct the problem, the flame sensor may demand to be replaced entirely.

Low airflow

When a furnace starts and shuts off, it could exist a sign that you have low airflow. The heat exchanger in the furnace will oft overheat if at that place isn't enough airflow. This particular issue often occurs if the furnace is located in a crowded storage surface area or has a block in the air inlet leading from the outside into your habitation. When the exchanger heats up to the maximum temperature, the furnace shuts off afterward a few minutes.

Call back to replace your air filters!

Solving the issue of low airflow requires a multi-pronged arroyo. Kickoff and foremost, make certain that all of your air filters are clean. These should be replaced every few months to make things easier on your HVAC system and to ensure that you filter clean air into your home.

The furnace won't be able to pull fresh air into the blower if the air filters are chock-full with grit, pet pilus, and other debris. You lot should also make sure to open all of your air supply vents.

Next, you should check the outdoor air inlets to make sure they are not blocked by water ice or other droppings. If your gas furnace shuts off later on a few minutes, you lot might take a buildup of debris from pocket-size animals, plants, and other miscellaneous items.

Faulty pressure switch

A defective pressure switch is some other central reason why your furnace turns on then off afterwards a few minutes. The pressure switch should close with airflow from the draft inducer motor through the burner to indicate that ignition is safe.

If the switch is defective, it does not notify the ignition that it is rubber to continue. Equally a result, the ignition is paused after merely a few minutes, and the furnace shuts off. A multimeter can help y'all to make up one's mind if there is an event with the pressure switch.

Faulty draft inducer motor

A faulty typhoon inducer motor goes manus in hand with a faulty force per unit area switch. The main role of a draft inducer motor is to draw air into the burner and out the flue. It also brings in enough air to permit the pressure switch to close and activate the ignition process.

A furnace draft inducer blower

If the draft inducer motor is defective, it won't provide the proper circumstances for the pressure switch to close and ignite the furnace. This will result in a furnace that turns on then off after a few minutes.

Lacking command lath

The control board is ultimately responsible for supplying power to all of the inner workings of your furnace. When this piece is defective or broken, the furnace starts and shuts off over again rather rapidly.

A furnace control lath

Without the control board, in that location will be no power supply to the ignition system that keeps the furnace running for longer periods of time. Unfortunately, at that place are no unproblematic fixes for a faulty control board. Information technology will just have to exist replaced to correct the issue you are experiencing with your furnace.

Finding the source

If your furnace turns on and then off afterward a few minutes, it could exist a relatively minor prepare or the sign of a much larger effect. Some handy homeowners are able to solve the problem in an afternoon.

However, you may need more serious professional assistance. Making major modifications to a gas furnace could be dangerous for yous and your family unit. Be sure to consult with a local professional person HVAC company to ensure that your furnace is in prime shape for the coming wintertime months.

• Author
• Recent Posts

Michael Joseph has more than than twenty years of hands-on experience as an avid home handyman and had 10 years in the construction industry, specifically in the field of HVAC.

nixsublegand.blogspot.com

Source: https://www.h2ouse.org/furnace-turns-on-then-off-after-a-few-minutes/#:~:text=Dirty%20or%20faulty%20flame%20sensor,shuts%20off%20and%20starts%20again.

Share this post