While you wait for answers, we may have found some information which could help you.
Click here for Replace Upright VacuumDyson dc33 has new belts but won't engage in carpet mode?
Miele vacuum cleaner- c3 powerline?
How to reset brush roller on dyson dc 41?
How to repair this unit?
Wiring diagram for Karcher WD 3.5 vacuum cleaner?
How do I fix my bissell proheat?