Sounds like the filter is clogged. The device troubleshooting may mention that, but it could also be under maintenance & upkeep. The AC transfers air through the filter to pump cool air out. A clogged filter means less air is pulled as easily, so the system works harder but less effectively than normal. https://www.google.com/search?q=amana+wall+air+conditioner+troubleshooting&oq=amana+wall+air+condit&sourceid=silk&ie=UTF-8