How too fix Indesit WIA121 washing machine?

hello,
Ive had my Indesit washing machine for about 2 and a half years now. its been a decent appliance till this week, in which it wont wash.
the problem i have is the door will not lock, the doors led flashes red when on? so it wont wash while the door is not locked. Ive tryed switching off the machine for a while and still the same, im close too buying a new one as the repair costs are like 160 pounds, abit less than buying a new one, but you know money is not flush.
im wondering if there is a quick fix for the door problem, its either a physical problem or something with the machines computer system which is not so advanced.
Any help is apprieciated.

sincerely
lalith