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Hello from JA My name is Woody. I will be glad to assist you today. I have been servicing ALL Major Brands of Appliances for 35 Years, and have over 100,000 in home repairs and over 80,000 internet repairs under my belt.
Now the MCU is the motor control it has nothing to do with the water coming into the unit!
Are you sure you mean the MCU ?
The CCU is the only thing that controls voltage to the water inlet valves .
By chance did you ohm out the water inlet valves to see if they were good or not.
It could be the valve ,but if the valves are good .and it will still not fill in a automatic mode ,and ONLY in a manual mode I would replace the CCU .