Original post by: semiretired48 ,
As mayer stated, replacing the valve would be the easiest way to go. If you're going to pull the valve out, you can then visually inspect the inlet and outlet ports to see if there are deposits. There are strainers on the inlet side of the valve where you may see the deposits, particularly the hot water inlet. If there are visible deposits, you could put CLR in a pan and soak the valve to try to remove the deposits. Only put enough in the pan to cover the inlet and outlet ports and not the electrical connections or solenoid.