There is a two year guarantee with Bosch, so if it is within this period the retailer you purchased it from will give you the repairline phone number and they will arrange for an engineer to call free of charge.
On the inside of the door of the machine, near the hinge, you will find a sticker with details printed on it. A 12 digit number beginning 'E-nr' and also an 'FD' number about four digits long.
You will need both these numbers and the date of purchase when you make contact.
If you cannot find your receipt, the retailer should have a record of the date of purchase.
Good luck.
Davy Mac
March 2009