Clearing a clog in a vacuum is quite an easy task. The first step is to get the owner's handbook and read through prior to starting any repair work. Locate the clog in the system, and also check the vacuum hose. This is imperative in order to avoid making any mistakes during the maintenance work.
After reading through the manual, locate the clog in the vacuum cleaner. If all outlets produce low suction, the clog is either in the hose or between the first outlet and the canister. Check the hose for clogging by using a ball bearing or marble. If the marble fails to pass through the hose, then there is a clog in there. A stiff wire can be used to clear out the clog, but be careful not to damage the hose. If the hose is not clogged, check all the inlet valves. A clogged valve requires something with powerful pressure, such as a second vacuum cleaner or a shop vac. Fit the vacuum cleaner hose into the clogged inlet valve, and switch it on. The vacuum cleaner might suck the clog. If the clogged is not cleared, use a plumber's snake with a grapple that can hatch the clog and pull it out.