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did you buy it second hand? Looks kind of screwed-up. Sorry, no user's manual available on line. Maybe contacting them? http://www.cylex-uk.co.uk/reviews/viewcompanywebsite.aspx?firmaName=power-devil&companyId=13001676
Check all of the filters. When there's extra heat, it's usually blocked filters.
If not, dismantle the wand and use long pipe cleaners or a bottle brush to clear any possible jams in the wand or head. Remove the hose from the main unit and if possible, drop ball bearings or marbles down the hose to try and clear any blockage. Remember to recover all of the ball bearings or marbles before you reassemble the hose and wand.
Most likely the speed control board has failed. The solution for this is to replace the electronic unit unless you know of someone who can diagnose and repair circuit boards. The part is common and easily replaced for around $60. Miele's website can point you in the right direction for a service center, or tell me your zip code and I'll look it up for you.
It automatically switches over when you disconnect the hose from the power nozzle. No suction it getting to the power nozzle, so the suction is only through the attachments. If there is no suction through the hose, check for clogs in the hose and in the tank where the hose plugs in. Also, check the screen at the bottom of the tank. If there is a clog in the hose or tank, then there also will be no suction to the power nozzle.
Remove all clogs and you should get suction.
Was it hot when you pressed "+" button? Did you check the filters(Hepa) or bag if clogged or suction path was blocked? Does it happen after it was cool down? From what you said, it seems none of the above. Only thing I can think of is circuit board. The mortor runs in variable speed. "+" increase the average voltage to the motor thus higher suction. PWM circuit in main pcb may not working correctly.
High priced vacuum cleaner like this shouldn't fail like this but it does. JMO.
On the Hoover U6311-900 there is no switch that turns off the suction to the tool hose. That hose is attached to the head of the vacuum on the side via a spring loaded "door". Just twist the hose to remove it, the door will close and you will have full suction again.
It could be the switch or could be the suction motor. Also, there is a thermostat on the motor that will shut it off if you don't have the air flowing to keep it cool. If that is the case, the motor will re-start after it cools down.
If the motor dosen't start, the cheepest way to start is to buy a new switch and install yourself. Just make sure where the wires go. The single terminal is to the front and the two terminals to the rear. The black wire goes to the front single terminal, the red wire goes to the far back terminal and the blue wire goes to the front back terminal. The suction motor should come on first and then the power nozzel. If not in that sequence,reverse the blue and red wires.
If that fails, take it to the Aerus/Electrolux shop.
First test suction on unit without the hose, is there suction? If yes, attach hose and test. If no go to the door to outside, attach hose to the top of unit where it blows (under handle on top), put hose out door and turn on. The stuff clogging the hose should blow out the end.
If it wasn't the hose check the wand, and then the power nozzle and using the above to clear obstruction.
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