Is the washer leaking at the hose connections? Are the gaskets missing from the inlet hoses?
Check to see if the washer is leaking where the inlet hoses are connected to the washer and to the faucet. Make sure that both ends of both inlet hoses contain the hose washers. Make sure that all the connections are tight. If necessary, tighten the connections to avoid leaks. Do not overtighten. See the Installation Instructions for details; enter your product model number in the search tool below to find them online.