Maintaining your central vacuum cleaner is crucial to extending its lifespan. Ensuring the filter is cleaned or changed often is vital to ensuring clogs don’t impact your motor. In addition, inspecting motor brushes regularly and lubricating the engine when needed helps keep it in tip-top shape. Finally, cleaning the central vacuum hose of dirt and debris helps keep clogs at bay, especially if you’ve vacuumed something wet or sticky.

The disadvantages associated with central vacuums start with cost. They are expensive to install, especially in existing homes, as retrofitting requires opening walls. The system's bulky hoses can also be inconvenient to maneuver and store compared to portable vacuums. Additionally, repairs may need professional service, adding to maintenance costs. Lastly, while powerful, they may be overkill for smaller homes or apartments, making the investment less practical for some households.

A central vacuum system can be a worthwhile investment depending on your needs and budget. While the upfront cost is higher than a traditional vacuum cleaner, it offers significant long-term benefits. These systems can save you time and make cleaning your home easier, as you only need to carry the hose and vacuum head, eliminating the need to lug a heavy unit up and down stairs. They also tend to operate more quietly and can improve indoor air quality. The convenience and performance over many years may make it a valuable addition to your home if you can budget for the initial installation.

Common repairs for central vacuum cleaners include motor repair, electrical repair, and blocked filters. Central vacuum motor issues typically come with a burning smell and loss of suction. With these issues, you might need simple lubrication to keep it running smoothly, or for more extreme problems, you could need a motor replacement. 

Electrical problems or losing suction strength, might be reasons to swap out electrical components for new ones. However, a local central vacuum repair professional can tell you the best plan of action for your system.