Had same problem myself, got great information how to sort this problem out, on , www.fixya.com, and also peugeotcentral.co.uk But its very unlikely to be the fuse, as something else would also be not working as its a multi fuse. ( covers sevral other items) But its a good idea to check it first. You will get the heater fuse number which is listed with other items in you manual. If not the fuse, disconect heater blower as explained in above recommended websites , check if working or not by simply useing two short lenghts of suitable cable , connect to car battery , one to positive and one to negative, then get someone to hold motor, whilst you touch the two connector spades on the motor. If their is power getting to the motor and it does not run its probably had it. If it working , then you have to check the resistor. Check out the websites above as they give better instructions than I could to do so. Hopes this is of some help.
bernard
December 2009