This model sits in the middle of the Triflex range, with the HX1 being the entry-level version, and the Pro the next step up.
If the smell is mechanical or burning, then this is more likely to be caused by a fault.Switch off the vacuum and take it to a professional to repair, as it could be dangerous to continue using it..

Causes of a Bad Odour From a Vacuum Cleaner.your vacuum cleaner smells bad can help you to remove the odour.Here are some of the most common reasons:.

Grime and Dirt Build-Up.Grime can accumulate inside your vacuum cleaner over time.

As air is pushed around the vacuum cleaner, unpleasant-smelling particles are picked up and pumped back into the home.. Mould.. Any dampness inside your vacuum cleaner could allow mould to grow.
To prevent this, avoid vacuuming damp material, such as wet mud or a damp carpet.. Pet Dander and Hair.How to Clean a Clogged Vacuum Hose.
Clean the Vacuum Exterior.You’ve now cleaned your upright Dyson’s filter, bin, hose, and brushroll.
If your vacuum was filled with dirt before, then this could make a big difference to suction power!.The final step is to wipe down the vacuum’s exterior.
(Editor: Elegant Irons)