This is a common complaint with vacuum cleaners of all types, especially those in the lower price ranges. If your cleaner appears to have lost suction, the first order of business is to check the dirt cup. If it’s full, empty it. Take note of any other areas of the vacuum cleaner where debris, including long pet hairs, may have created a clog as well. It’s a good idea to familiarize yourself with the detachable parts of your vacuum cleaner so you don’t inadvertently miss the chance to clean out any pesky clogs. Sometimes, when a vacuum cleaner is taken apart and emptied, it is not put back together properly, resulting in an air leak or other issues. This could be the cause of the malfunction. Make sure all snap-on parts and joints are fitted correctly. Lastly, check the filters of your vacuum cleaner. They may need to be cleaned or replaced, depending on the type of vacuum you have. If you’re unsure what to do with a dirty filter, check the product manual. If you don’t have the product manual at home, look it up online. Most manufacturers keep digital copies in an online library for consumer reference.