Comfortmaker Furnace Flames Out and Then Starts Up Again
Are yous getting used to hearing the familiar hum of your furnace only to hear it shut off once again a few minutes later? Many furnaces can get into the addiction of repeating this wheel over and once again. When the furnace turns on so off after a few minutes, you demand to effigy out the cause so that you can keep your domicile warm through the blustery winter temperatures.
A furnace that starts and shuts off over and once more is ofttimes described as brusque cycling. There are many potential reasons that your furnace could exist short cycling, and then let's 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, at that place is a practiced chance it is caused past 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 and then shuts off and starts again. This could be a relatively easy fix.
Homeowners can enlist the help of a professional to give their furnace a thorough one time-over, or they can clean the flame sensor themselves with a lightly abrasive pad. If cleaning it doesn't right the problem, the flame sensor may demand to be replaced entirely.
Low airflow
When a furnace starts and shuts off, it could be a sign that you have low airflow. The heat exchanger in the furnace volition ofttimes overheat if there isn't plenty airflow. This particular issue frequently 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 dwelling. When the exchanger heats up to the maximum temperature, the furnace shuts off after a few minutes.
Recall to replace your air filters!
Solving the issue of low airflow requires a multi-pronged approach. Start and foremost, brand sure that all of your air filters are make clean. These should be replaced every few months to make things easier on your HVAC system and to ensure that you lot filter clean air into your home.
The furnace won't be able to pull fresh air into the blower if the air filters are clogged with dust, pet hair, and other debris. Y'all should also make sure to open all of your air supply vents.
Next, you lot should bank check the outdoor air inlets to make sure they are not blocked by ice or other debris. If your gas furnace shuts off after a few minutes, you might take a buildup of debris from minor animals, plants, and other miscellaneous items.
Faulty pressure switch
A lacking pressure switch is another key reason why your furnace turns on and then off later a few minutes. The pressure switch should shut with airflow from the draft inducer motor through the burner to bespeak that ignition is safe.
If the switch is defective, it does not notify the ignition that it is prophylactic to go along. Equally a issue, the ignition is paused afterwards but a few minutes, and the furnace shuts off. A multimeter tin can assistance y'all to decide if there is an issue with the pressure switch.
Faulty typhoon inducer motor
A faulty draft inducer motor goes manus in paw with a faulty pressure switch. The main office of a draft inducer motor is to draw air into the burner and out the flue. Information technology likewise brings in enough air to allow the pressure switch to close and activate the ignition procedure.
A furnace draft inducer blower
If the draft inducer motor is lacking, information technology won't provide the proper circumstances for the pressure switch to close and ignite the furnace. This will event in a furnace that turns on then off afterward a few minutes.
Defective control board
The command lath is ultimately responsible for supplying ability to all of the inner workings of your furnace. When this slice is defective or broken, the furnace starts and shuts off again rather speedily.
A furnace control board
Without the control board, there volition be no ability supply to the ignition system that keeps the furnace running for longer periods of time. Unfortunately, there are no simple fixes for a faulty command lath. Information technology will merely have to be replaced to correct the consequence y'all are experiencing with your furnace.
Finding the source
If your furnace turns on and then off after a few minutes, it could exist a relatively minor ready or the sign of a much larger issue. Some handy homeowners are able to solve the trouble in an afternoon.
Still, you may need more serious professional help. Making major modifications to a gas furnace could be dangerous for you and your family. Be sure to consult with a local professional HVAC company to ensure that your furnace is in prime shape for the coming winter months.
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Michael Joseph has more than 20 years of hands-on experience as an gorging dwelling handyman and had x years in the structure manufacture, specifically in the field of HVAC.
Source: https://www.h2ouse.org/furnace-turns-on-then-off-after-a-few-minutes/
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