I have a Zanussi washer/dryer model ZWD16270W?

the wash works perfectly and the dryer works but the drum doesn't get any heat. Someone has pulled the connectors off and not marked where they came from. There are 2 white cables and a double grey one. Do you know the order they need to be connected please? we inherited it when we moved into an apartment and it doesn't look very old, everything is clean & shiny with the cover removed.