According to your ip address you are posting from Hong Kong so I would contact G.E. direct from this contact page for a set of instructions as there are none to download from the net.
Strangely enough Bing search brings up the model for various spares,wuth Creda and Hotpoint .At one time GEC and Hotpoint/Creda were part of the same group ( we used to get discounts on Hotpoint working for GEC) ( loooong time ago)