how can i fix my indesit condens tumble dryer model is70c?

Can any 1 help me my tumble dryer. Won't heat up its just blowing cold air iv looked for the reset button but can't fined it I know there is 1 as I had to call an engineer out after having it for 6 months he said it was just the reset button but I never seen where it was so was wondering if any 1 could help me out as I need my machine for my sons bed clothes alot he is disabled so im struggling alot at the moment would be grateful for any help thanks