Had a similar fault with our DI620 where the machine had done a wash but then didn't seem to empty properly leaving water in the bottom. On the next wash wouldn't fill and the No 1 light came on and flashed. If the machine was tipped over and the water emptied out the machine would do another wash then the same fault occurred.
Couldn't find this 'light fault code' in the handbook so phoned Indesit who advised this indicated it was overfilling and we would need an engineer to call.
Called engineer who advised there was a leak which was dripping onto the wash/pump motor assembly and shorting it out - he replaced the motor and the machine worked.
Have to say we have had mixed feelings about the Customer Service of Indesit which has ranged from excellent to down right rude!!
Hope this helps.
Graham
April 2008