error F28 in mid cycle

check error code : no water flow
pulled hoses [hot& cold] to clean screen in line.
pulled flow meter out from under top of hood to clean and check free wheel movement inside.
still error code F28 in mid wash cycle. called in and talk with service: he explained that hot& cold water valve was opening to slow or not enough for flow meter to read full presure. I replace water valve and flow meter. washer is doing fine. [I was getting readly to go in futher down the line and get new controler. talking to service stop me from spending a lot of money. THANK YOU