F11 error code during Diagnostic test?

I went through the forums, and answers from many experts/learner/diy guys....

My washer started showing f11. I ran the diagnostic test, so it goes from C0 to C1 . it runs for 15 -20 seconds approx in C1 and then throws F11 error.

Seems like it cannot go to C2, but obvious.

Opened CCU, checked all the connection, opened MCU checked all connection. Nothing i can find off...

I dont want to replayce CCU or MCU and then have the same problem after that, instead buy new one right ?

I really need some advise :(

I appreciate any help from the members/experts anyone.