Firstly you have to identify what model you have then you can find the parts on ebay.Its proberbly your thermostats and the best place I've found for them is NORTH EAST APPLIANCE SPARES on ebay or colin391(ebay) you could get front and back for less than £20 and the parts are pretty easy to fit solongas you are careful
hope this helps
Allen Dawson, March 2007