I've got one of these in for repair, the first Miele upright I've seen. It's enormous, feels like an SUV equivalent to Dyson's supermini size models!
It has been used without the bag retaining clip (seems to be a common issue, people unwittingly chuck 'em away when they change the bag). This means a lot of dust in the bag chamber, and, since the owner also cut the replacement pre-motor filter too small, a fair amount of that dust has lodged in the motor. It was reported as cutting out, then wouldn't start at all. The red overheat light is also on, so I thought that the TCO was either jammed with gunk, or burned out. It seems to be a common issue on these models.
I stripped the motor down, which wasn't too bad. Armature, brushes and commutator all look fine.The thermal cut-out was dusty, but no signs of burning. So I cleaned everything and rebuilt it. But it still won't start, red overheat light stays on.
Is it safe to say that I just need to replace the cut-out, or is there anything else it could be? And, if it is the cut-out, does anyone know where I might source one? The Miele part no is 7463591. Maybe buy a non-working motor and swap over the cut-out, they look similar on other Miele motors? Buying a new motor at £120+ is not really an option.