To save yourself the cost of a repairman, if your washer is filling slowly. Turn off the water at the valve, and take the hoses off and be sure that the connection is clean. When my washer was filling slowly, I did this and found that the hose was partially blocked by sediment. I just cleaned out the sediment, replaced the washer (rubber ring), and reattached the hoses. Then I turned on the water, and it works great.
It is true, the setiment is from hard water, when my husband cleans it out, he says it is calcium deposits from the hot water tank and the hard water. As soon as he beats it out of the hose, the water fills up alot faster. This same problem hinders toliet fill ups also. But, can't be solved as easily.