Bosch universal mixer

The safety Lock on the bowl hasn't released. You will see it in a tube where the lid lock is. When the lid it locked into place, it pushes a rod down into a hole in the base to operate the safety switch. You may be able to pull it up with needle nose pliers.

https://www.google.com/search?q=how+a+food+processor+lid+safety+lock+works

That is a funny looking machine, so none of what I wrote may apply!

https://www.google.com/search?q=bosch+universal+kitchen+machine

It is a known issue with that Mixer.

https://www.thefreshloaf.com/node/69164/bosch-universal-um3-too-much-bowl-wobble

https://www.google.com/search?q=bosch+universal+bowl+wobbles

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I do not know a lot about this machine. I am a DIY fix anything. It sounds like one of the mounting points on either the motor or the gearing gave way. Regardless it is new, send it back & have it fixed or replaced. Sorry, I know that is not what you wanted to hear, but is safest considering your investment.

The problem will be with the worm gear, if the gear is not stripped then check that the locating pin for the worm gear is not broken or missing. Occasionally the plastic gear can detach from the aluminium boss between plastic and shaft. The worm gear is the 99.9% place where drive can slip. Afterthought, I suppose the planetary pin is not missing or broken??

goto https://boschmixers.com/contact-us/

HI.Let me jusk ask if yiou also tried to connet to another socket.Let me just clarify that the motor itself did not work /rotate as well.Prior to that situation,have you tried to mix more than what is the capacity of your mixer.If possible motor was overworked/that's why its coil was burnt.There. are possibilities then. First might be that the mixers terminals inside will no longer engaged properly that's why it opens the circuit.Second the motor isn't working because the rotor and armatures coil was burnt because it runs beyond its maximum wattage capacity that's why it draws much current beyond the rotors coil capacity.Did you mixed something heavy.the motor works heavier the last time you used the unit?

I had (have) the same problem with mine. It would stick occasionally and then one day it wouldn't come off at all. The bowl would unlock and turn like it should but wouldn't lift off. After much time and effort I did manage to get it off and found that the splines on the shaft were scored. When I examined the receiver part, the lugs (splines?) on it were worn allowing the shaft lugs (splines) to overlap the base lugs and thus becoming jammed.

I cleaned everything completely and made a batch of bread dough and it's stuck again.

I think the base receiver needs replaced but it may be part of the transmission and maybe the whole thing needs replaced, I don't know.

I sent an email and left a message with Bosch service and will post again when I hear from them.

I have used the mixer for about 4 years and love it but this problem shouldn't happen I don't think. It seems like a design flaw to me.

Your mixer may still be good, let it cool down and then check it out, If it runs OK then there is no problem. The motor in your mixer probably over heated from trying to mix bread dough which will make any mixer work hard. These mixers will get warm when over worked but unless heavy smoke was coming out and you were getting a burning enamel smell it is probably OK. Let it cool and try it but I suggest you not use it for bread any more.

No I havent found a dealer because Bosch no longer make the hand mixer. I cant afford to pay anyone to help me find an outlet for the Bosch mixers.