I have the same problem, so I rang up Indesit (0870 60 70 805) and they tell me that A01 message is that the machine will "drain until empty + 1 minute" and probably means the machine has overfilled itself and the cutoff float is in operation.
The answer seems to be to tip the machine (so that the water in the machine goes over the floor) so that the float can drop down again.
Of course this may not always work.
Accountant
January 2005