The answer to 'why is my vacuum odor' is that a vacuum cleaner can develop unpleasant smells for a variety of reasons, such as a dirty filter, built-up debris, or a problem with the motor. Common symptoms include a musty, stale, or burnt odor coming from the vacuum.
Some common causes and solutions include: 1) Dirty filter - clean or replace the filter as recommended by the manufacturer. 2) Clogged vacuum - check and clear any blockages in the hose or canister. 3) Worn motor - if the motor is failing, it may produce a burning smell, which requires professional repair or replacement of the vacuum.