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The brushes are supposed to continue to roll, even when the cleaner is in an upright position. However, the cleaner is supposed to raise fully up, so that the brushes are away from the carpet/floor. This is controlled by a reed switch on the lower circuit board and a small round magnet in a post on the swivel head.
Unfortunately, this magnet is only glued on, so after a period of time it may become detached. It sounds as though this is what has happened (though the circuit board might have failed or something, but that is rather unlikely).
If you are lucky, you may be able to find the magnet inside the housing - according to the Sebo helpline, there is really nowhere for the magnet to go and it will probably be stuck to some other metallic part. If you find it, I presume you can just glue it back on again. I don't know whether it matters which way round the magnet is placed. I rather expect that it does, so you should make sure it is replaced the same way round - I would look for glue residue on the magnet.
If you can't find and replace the magnet, then you have to buy and replace the swivel neck assembly.
Then, at the back of the Right Hand Swivel Neck Support, there is a small lug that catches into a recess in the channel it fits into. You need to prise back the channel just near the foot pedal, to allow the Swivel Neck Support to pull upwards.
Remove the neck supports, replace the swivel neck with the new one with the magnet in place and reassemble.
It sounds like you may have been given the wrong brush roller. Several models of Oreck's have a sensor in them that watches for the brush roller turning at the proper speed. The way they do this is by mounting a magnet into the brush roller and the sensor counts the number of times the magnet passes. If that magnet is not there or if the sensor does not detect the magnet passing, ie..a broken belt, it will shut the motor off. The only way you can fix it is to get the correct brush roller and put it back in. Hope this helps!
What is it doing? Motor stopping and starts after it sits for a while or only runs for a short time? That's because it's getting too hot, all motors will do this when they overheat. That is how you know it's going bad, insufficient air movement around the motor will cause this. Not every motor has a reset, in fact most rely on the circuit breaker or a fuse to keep them from drawing too much current. It will not stop it from getting too hot, just keep it from drawing too much current which will eventually melt the wires if there's no breaker or fuse in the path. The wires that wrap around the stator and rotor in the motor will become very hot and after a while they will end up shorting out due to the coating on the wires melting or burning off in spots. This causes the magnetic field in the motor to break down, the path of current is no longer flowing through the entire path of windings which makes the magnetic field.. this in turn produces the spinning effect on the shaft. If it is loosing power and stops running it's most likely in need of a rewinding. If it has a reset please send a picture, I haven't seen a vacuum with one yet. But i have only owned Kirby and Kemore so There may be some models that have poor design and require a safety reset to keep them from catching fire?.
Look at this video https://www.youtube.com/watch?v=74IxduzYTII
at about 8 minutes, 54 seconds. The yellow wheel with the belt has a magnet on its right hand side, and the grey wheel has a magnet on its left and side. The magnets are sensed by a Hall Effect detector which is the thing at the end of the circuit board.
Maybe the magnet you found needs to be glued back into the recess in the wheel. Probably it needs to be the right way round, so I would look for glue residue on the magnet.
There is a small magnet in the end of the hose. Under the phillips screw and plastic cover. Mine rusted to bits and stopped tripping the switch. A bit of a super strong hard drive magnet siliconed back in the end of the hose and all was fine.
Battery voltage low? To test a battery you need to place a load on it to get the true reading of the power left in it. A straight test with a volt meter at no load is a misleading indication and will almost always give the battery rated voltage, even though the battery is almost dead.
A bar magnet is permanently magnetic, thought not usually especially strong. An electromagnet is caused to be magnetic while energised by a power source. Many bar magnets are created by being subjected to an electromagnetic field.
Farmerbear at FixYa.com