Ariston Oven not heating up?

A few related questions, but nothing specific... fan is working, light is on, but no heat in the oven. Has happened before, but managed to fix. Think this time it happened due to switching temp of oven right up, and clicking past oven onto grill. Since that moment, no heat and nothing I can do will make it work again. Last time I fiddled with buttons and it started working again, but dont know which buttons I pressed. No luck so far. Electrics fine, etc. As its happened before and been fixed, I'm doubtful its the element.