The particular machine you have is one of Indesits new generation machines and these are always a big problem[even for an engineer] as many things upset the balance of the system, could be low water pressure, could be the pressure switch playing up, could be your drainage pipe too low at rear that is stopping the machine filling enough, could be a blockage in pressure system and so on,and so on,and so on. I think you get the picture, I think you should check the obvious such as drainage then call an engineer.
Powerhousesteve., March 2005