My WID126S washer dryer has stopped drying any help please?

My indesit wid126s has been running fine and have had this for about 2 and a half years now but all of a sudden it has stopped drying now it goes through the cycle as if it is drying but it doesn't heat up and doesn't dry the clothes. any help on rectifying this issue would be great i am quite good usually at fixing these sorts of things but i would just like some help before i do! Thanks in advance Tony