Hi, have you tried the various positions on the front part of the gearbox behind the 'chuck'?
If so, then Im afraid it must go in for repair. These are not an easy fix and personally I would recommend you ask for a 'quotation' as it could be just something simple to do with the 'Gearbox' selector, but it could also be something a lot more serious within the Gearbox.
Good Luck & Best Wishes, John..
I am hoping that you know Bosch has specific bits that fit their hammer drill. Not all bits will work with bosch. If you have the correct bits then your gears in the head of the drill are stripped or broke. Depending on the model some of the gears are metal and some are plasticand when the hammer drill is used and debri gets into the inside of the casing it will cause the gears to strip and after a while eventually the gear teeth will break off completely
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