Question about Miele Vacuums
It could be either the switch, the motor, or the cord reel. Try plugging it in and slowly feeding the cord in and out while clicking the power switch on and off. If the motor kicks on while doing this, you have an intermittent short in the cord reel.
If you remove the bag chamber lid, (on the s300 series merely opening it until it makes an awful cracking sound, and then lifting it off;) you will be able to access the screws to remove the rear housing. Under the exhaust filter are two screws that will allow you to remove the control unit, and then there are about five screws on the top that will need to be removed if you need to go further.
The control unit contains the switch, which you can test continuity through by using a VOM. If the switch checks out ok, you can test continuity through the other electrical components on the underside of the control unit. If you find a component that does not have continuity, replace it. If they all appear functional, continue with the disassembly:
On the s300 series it is easiest to flip the machine upside-down after removing the top screws, and then lifting the base away from the top housing. This will give you access to the motor and the cord reel.
What can occasionally happen with these cord reels is that they can wear out, allowing too much lateral slop of the actual reel assembly. You can shim this by using something on the axle in the center to push the reel assembly back against the contacts. I use a small rubber "doughnut," but pretty much anything non-conductive will do the trick.
If this doesn't restore electrical continuity, you'll probably need a new cord reel. I highly recommend against trying to do any further repairs on the cord reel itself, as it's a nightmare to deal with... especially if the main spring comes apart.
Any other problems will have to be referred to a repair station, since it could then be either the motor or the motor control board.
Do NOT attempt to test the motor by directly connecting it to wall voltage, as the actual power applied to the motor when it is functioning is stepped down by the circuits attached to it, and attempting to "hotwire" it will fry the motor.
Hope this helps,
Posted on Aug 01, 2008
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Posted on Jan 02, 2017
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