I have a indesit idl 530 that is 16months old the fourth light flashes and it wont heat up the internet discusion groups say it probably the relay on the control board as it is a common fault
Dishwashers - Indesit - 24 in. IDL500 Built-In Dishwasher
Answers & Comments
Exact same, mine conked out after 14 months, just after the warranty period.NB - I take it we mean button on left as you look (being no 4) .