Can Fan Furnace
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Can Fan Furnace
Why won't my furnace heater fan turn off?
I have a regular gas heater/furnace/AC set-up. For the first time, the fan won't turn off, even when I turn the control to 'off'. I took the two metal covers off the heater in the garage and the fan DID shut off. I replaced the filter. I put the covers back on and it stayed off. But the next time I turned the heater on and then off again during the next warm day the same thing happened.
well, when you took off the covers, you tripped the safety switch. it is there so you don't get your fingers caught in the blower if it were to try to turn on. this sounds like a problem with the furnace controller. some are digital and others have solenoids. if it is digital, you may be able to find the problem if it has a diagnostic light. if it is a simple one with solenoids, it should have see through solenoid covers. one of them may be sticking. another problem may be the thermostat built into the burner area. for some reason it could be telling the system that the hot box is still hot and that the blower needs to stay on to cool it. you should have an owners guide somewhere around the furnace unit that would have a trouble shooting guide. if you still cannot find the problem then you shouldn't risk a larger problem by putting off calling a pro(sad as it is to have to call one)
Solar furnace / air heater (wall)
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Just as you may have noticed that your automobile runs more smoothly after a fresh new oil change, the same principle works for your furnace, when it comes to a new or clean furnace filter. The main component for both hot water and forced air heating units is called a heat exchanger. The purpose of this nifty component is to take the heat that is produced by burning fuel in your furnace, and to transfer it into the water or air so that it can be distributed through the entire house. The heat exchanger is traditionally concealed from view in hot water heating systems, and is only occasionally visible in forced air systems.
If you look at a modern forced-air gasoline-powered furnace, here is everything that you will find. First, you will find a solid-state furnace control, which has a fan assembly and is visible in the power rear of the furnace. Next, you will find a draft inducer, which provides fan-forced exhaust. Third, you will find both an igniter, and a flame sensor, because your furnace is actually running on firepower. Next, you will find the gas valve and manifold, along with gas burners. On the outside of all of this you will have the heat exchanger, followed by furnace filters or other air filters. Keep in mind, several aspects of this concept will vary based on the model of furnace that you use, though some things will remain the same, including the igniter, the furnace filter and the heat exchanger.
Learn more about keeping your air filters clean by visiting http://www.home-air-care.com/furnace.htm.
The thing that makes heat exchangers malfunction or inoperative in general is the development of a hole, crack or warping that allows hot water to escape, or combustion exhaust to escape into the home's interior air. Heat exchangers do eventually crack or warp over time simply because of the constant heating and cooling that the system experiences throughout the year. However, most heat exchangers can last a significant amount of time, often past their predicted life span depending on whether or not conditions are ideal. Regular cleaning and maintenance of the furnace do play a large part in determining the life expectancy of a heat exchanger, as well as the environment that exists around the furnace unit. Get more information on how to winterize your home with clean furnace filters at http://www.appraisalmatters.com/WinterizeYourHome.
Another heavy contributor to whether or not heat exchangers live out their lifespan properly is reduced airflow, which comes as a result of dirty furnace filters, dirty fan blades, obstructed air vents and dirty duct work. All of these factors contribute to wear on the fan motors, which can significantly reduce the efficiency of the furnace, prematurely burning out the heat exchanger as well. Both fuel-fired and forced-air furnace types are prone to overheating in response to airflow obstructions. Most modern furnaces are built in a way that allows them to shut down if temperatures become unreasonably high based on a dirty or overused furnace filter. However, if the internal temperature elevation caused by dirt and debris is only moderate, the furnace may not switch off but the heat may still be enough to cause metal fatigue to the head exchanger, which can cause serious issues down along the line. Get more informative tips on how to keep your furnace filters clean by checking out http://www.creativehomemaking.com/cleaning/furnace-air-filters.shtml.
The best way to protect yourself from premature burn out of the heat exchanger in your furnace is to have an annual inspection and a monthly cleaning of your furnace filters. The exam, which should be conducted by a licensed mechanic, should be relatively inexpensive while affording you a great deal of peace of mind. Another useful innovation is the carbon monoxide or CO detector, which is an easy and inexpensive way to protect yourself against exhaust leaks from your furnace.
About the Author:
Bill Whitworth writes furnace filter related articles for WEB Products, Inc.
www.webproducts.com
is the premier supplier of furnace filters, air filters, replacement filters and custom filters. Serving customers online since 1997.
Article Source: ArticlesBase.com - Avoid Premature Heat Exchanger Failure With Your Furnace
