How can I fix my delonghi electric fire -YCT-100 ?

Hi,
Please can anyone help?
My mother in laws fire is not working... We believe this is a common fault as I have seen some questions from others who also have this problem... Apparently replacing the circuit board fixes the problem?? I want to do it myself. P.s the most annoying thing is its only been used twice and delonghi will not help as its run out of warranty.