How to repair a leaky shower faucet. The same principles apply to most sink faucets too. A leaking single control shower faucet can be repaired in a very specific way. Repair a leaking single control shower faucet with help from a licensed plumbe Step 1. Turn Off The Water. Exactly the same as with the showerhead, locate your main water supply and ensure it’s turned off before beginning. Step 2. Disassemble The Valve. Start by removing the handle from the valve. The centre screw will can be loosened with a screwdriver for this part to be easily detached. Step 2. Disassemble the tap. Use a screwdriver or allen key to remove the tap handle. Depending on the type of tap, you may need to remove a decorative cap or cover to access the screw. Once the handle is off, you’ll see the valve or cartridge assembly. Step 3. When replacing a shower faucet, take off the shower head by turning the connecting nut counterclockwise with a pair of pliers. Faucet handles can be removed in different ways. Some have a cover plate, which can be pried off with a small screwdriver. Others, like the one featured in this video, have a small set screw somewhere on the handle. Is the water dripping or running in your bathtub shower? This video will show you how to remove and replace the shower valve stem and also how to replace the Replacement washers. 1. Turn off the water supply. Before you get started, turn off the mains water supply. You may need to lay down a towel or cloth to catch any excess water that drips out of the parts. 2. Clean the showerhead. Remove your showerhead from the hose, then soak it in vinegar for at least 30 minutes. This Old House plumbing and heating expert Richard Trethewey and tile expert Joe Ferrante team up to repair a leaky shower valve installation. (See below for 0V2pdn.