At 3 months old it will still be covered by the manufacturers warranty so you would be better off contacting them. If you tamper with anything, they will claim you have voided the warranty.....been there, done that.
Modern machines are all controlled by a circuit board and they do fail on a fairly regular basis and my guess is this is the problem.
I would lay money on the engineer replacing the board, a 5 minute job and the problem solved.
I can't emphasise enough, do not touch it and do call them out.