F2 code usually means a drain issue… it could be as simple as the drain hose being inserted too far into the drainpipe connection… or it could be the drain hose is clogged with something. It might be a stuck water pressure switch… it is attached to the inside wall of the washer. You may have banged it while servicing the CCU. Try tapping it GENTLY with the handle of a screwdriver. The only other thing that comes to mind is a clogged drain pump filter.

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