Simpson Aquapulse 713 7kg top loader?

My Simpson top loader is not spinning properly the machine stop on each spin and on the screen it comes up PU? not sure what it means im guessing it is plumbing jammed? Checked hose where water comes out thinking there might be a blockage, but nothing. When machine is in use we have noticed a little water is on the floor.
Could you please help? Any help would be appreciated

Thank you

Katt White
July 2013