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It has been my experience that these units are very air filter sensitive, i.e. if dirty or the wrong filter merv rating is used they will go into a limited mode - - - try changing the filter to a Merv 8 and see if it fires up normally .....


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i would say that rule of thumb must be different for different places. e.g if you're living in industrial area like where you have alot of pollution in the air , you must go for change before the time mentioned in the manual but if you're living in healthy environment like well planned societies than it could lasts more than specified time. In short you must ...



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