My first thought was that it was a problem with the drive belt or tensioner, but if it spins, that can't be the answer. That points to a main board or motor controller problem. In the first instance try a Power Reset. Disconnect the machine from mains power for a couple of hours, or preferably overnight. Press and hold the power button for 30 seconds and then plug it back in. If that doesn't fix it, you need a service call. It doesn't appear to be a known issue.
https://www.google.com/search?q=Siemens+Siwamat+276+front+load+washing+machine+not+agitating
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