Indesit IDL 50 Dishwasher

Had a similar problem (flashing lights 1 and 2). Drained the machine by diconnecting the outlet hose and using a shallow bowl on the floor. Removed and cleaned filters. Forced clean water through by using a garden hose pipe(you can only do this one way, you cannot force water down the outlet pipe). Removed and cleaned the pump (you have to do this from under the machine but easy enough). Finally ensuring the waste trap under the sink was clear. Bingo!! No parts, no expensive engineer.