Please click the link below to download the manual for the Matsui M12FDW09
The manual is in English. Please ignore the Japanese text on the cover. Unfortunately, it's unlikely having the manual will help you identify the cause of the fault.
I'm assuming the flashing light you are referring to is numbered 1
in the control panel diagram on page 2 (the 5th page of the PDF manual). This light simply indicates the dishwasher is in the pre-rinse stage of the wash cycle. Your description suggests the solenoid has failed, so the water inlet valve isn't opening and no water is entering the dishwasher.
I only repair Matsui washers on call-out as they are a Dixon's Stores Group (DSG) only brand in the UK, so I don't see that many of them and can't get service manuals. I can diagnose and fix them when they're in front of me, but I couldn't tell you from memory how to get access to the components and test them.
I hope this helps you a little, even though it doesn't really solve your problem.