Leaking water at water valve assembly

Ordered New water vave assembly. Received it in two days. Shut off water to water supply line. Removed old water assembly valve, by by removing one screw that hedt it in place, cut tubeing at base of water valve, unpluged electricla connections and removed old valve. Placed tubeing in new valve as I cut them and according to color coding, also connected electrical harness one at a time as I disconnected then. reconnected main water line and turned on water and everything worked just fine about 20 minutes.