I had that happen once and finally discovered the ball valve that controls the direction had twisted off and when the handle was turned the ball didn't move or only part way. I went to a plumbing supply and found the proper valve for less than $8. The same valve at a rv parts store was $37.
Fresh Water Tank Filling From City Water With Valve Closed
in Water and Holding Tanks
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I had that happen once and finally discovered the ball valve that controls the direction had twisted off and when the handle was turned the ball didn't move or only part way. I went to a plumbing supply and found the proper valve for less than $8. The same valve at a rv parts store was $37.