Why is my washer-dryer vibrating intensely during spinning?

Intense vibrations during spinning are typically caused by the washer-dryer not being correctly levelled or because the transport safety bolts have not been removed. Ensure all four appliance feet stand firmly on the ground, the machine does not wobble, and check levelness with a spirit level. If the transport safety bolts are still in place, remove them as described on page 24. (Page 20)