There are two types of central vacuum systems. One type is filtered and the other kind of vacuum has cyclonic cleaning. Cleaning of both types of filters is different. The filters and non-filter vacuum other parts cleaning is the same in both kinds of system. In filtered vacuum cleaning, the filters of the system should be changed twice or four times yearly. It is an approach to change the bags when they are almost full or at least three-quarters full. The changing of bags prevents the damage of the motor. In a few vacuums, the canister is visible. If the canister is almost full, change it. If the canister is not overloaded and you are experiencing blockages check the suction. In some systems, sticky particles are stuck on the suction and damage the filter and motor parts of the vacuum. You may use a plumber’s snake to remove hard. It will also remove the sticky substances that are hard to remove by hand.