Just had the same fault with mine. Phoned Ariston and they informed me that it was a filter block. Remove the front panel at the bottom the machine and remove filter that is on the right,and free blocked filter. If like me it was a coin then this may have jammed in the bottom of filter so you cannot turn it all the way to remove. You will then have to disconnect the pipes and remove the whole housing to shake coin out. Sounds a nightmare but not that bad. Remember to put a small bowl under the filter to catch the water that is still in there. Hope this helps
CJ, September 2005