Smeg DI612CA9 Dishwasher E1 Acquastop Fault repair

How to fix the E1 Fault "Acquastop Failure" on Smeg dishwashers. Acquastop is an anti-flooding system which is tripped in case of water collecting in the base of the machine, the fault is signified by an audible alarm and flashing of the left hand indicator light. This is the first time this fault happened on my machine so I haven't tried to identify any leaks, just cleaned up the water to allow the machine to work again. Obviously, if the fault recurs a more permanent repair will be needed.