F701-1 Leaking

Leaking from under the handle

 If  your  lav faucet is leaking from under the handle then there are 2 possible causes:

1.  Cartridge securing nut is loose.  Using a wrench, simply make sure part #5 from the following diagram is tight. F701-1 Parts breakdown
2.  Calcium build up on cartridge seating.  This can occur over time when hard water is present.  To fix this remove parts 1-6, clean out cartridge seating, thoroughly flush out faucet, and reassemble parts 1-6.