I have looked at the plastic wheel hight adjustment and I can see that the wheels cannot receed up into the vacuum. For the life of me I can't see how it ever did. The wheels can pop out easy enough but when cliped back in they obviously don't have the full ability to receed low enough to allow the adjustment lever contact with them to adjust the height. I hope this expanation makes sense. If not off to the store I go.
I think we got this figured out . . . . the height adjustment doesn't work when the vacuum is UPRIGHT, but when you disengage and lower the handle the plastic that is blocking the wheels from receding will rotate and then it can receive the plastic on the "top" of the wheel assembly. Try it and I think you will find that it works. I thought it was the wheels that were keeping the vacuum from working well, but that's not the case. Still don't know why it's gone to heck in 9 months.
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Re: Hight adjustor does not work...
The height adjuster won't work if the cleaner is put in the upright position or if the handle is locked upwards. Check under neath = where the beater bar is you'll see the main hinge where the wheels come down - sometimes they need a clean if anything is clogged behind - or the screw could be loose which keeps the adjuster dial to the plastic hood. Check that the wheels are moving when you move the dial around (with the handle and bin to the floor).
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Lock the vac in the upright position and then tilt the unit back off the front wheels, it should move easier. If the height adjust does not work, there may be a broken part, I would recommend service by a vac shop.
no. The auto height adjustment has nothing to do with this. Sometimes on these units the belt will stretch even just due to normal use. It is recommended that you change the belt at least once a year. Twice a year if you are a pet lover.
The height adjustment wont engage unless the handle is in the down position. Not knowing this led me to overturn the hight adjustment knob.
Step on the handle release, pull the handle back and lay the vac on its side. Then you can get the knob and the plate back together again.
BTW, the reason I had this problem is because the front brush slows dramatically when using on carpet, I thought it was set too low, and turned the knob (in a manly fashion, putting it past its limit). Still working on that one. After inspecting the belt, looks like one worn and cracked spot gumming up the works.
The Miele uprights (S170 and upwards) with the Powerhouse title are ALL Panasonic uprights which have been at one time sold in the UK. Therefore the upright may use TWO drive belts which need to be looked at: Take off the sole plate and examine the drive belt which is around the beater bar. Check that this belt is moving easily. Then look at the fly wheel to the motor (usually to the left hand side) and check that the smaller motor belt is moving - it may be broken which is why the beater bar isn't moving and why tension is tight.
Generally NONE of the Miele Powerhouse models have a manual selector for height adjustment - they all use auto adjustment which means no manual selector. The vacuum principle means that general carpet which comes into contact with the brush creates a vacuum anyway between the brush and the floor. If the brush isn't touching the floor then its a possibility dirt or debris has managed to get between the bottom 2 rollers after the beater bar. Check behind the wheels to see that there is nothing there - most auto adjusting Powerhouse models will have a spring behind the wheel and it may have come off.