How to Repair a Moen Shower Faucet

Moen licenses a wide array of kitchen and shower faucets from many different manufacturers that are based on its patented Moen cartridge system. The Moen cartridge system controls the flow of water as well as differentiating between hot and cold water pipes. Because of the cartridges constant exposure to water, it is recommended that cartridges be replaced every 3-5 years. Excessi buildup of calcium on a cartridge can lead to leaks or a reduction in water pressure.

Difficulty: Moderate

Instructions

Things You'll Need:

• Hex Key (3/32-inch)
• Moen replacement cartridge 1224
• Adjustable wrench
• Screw driver (flat tip)

1. Turn the water main handles counterclockwise at least half a turn to the "Off" position. The water main is typically located under the sink or cabinets and can be identified as one or two handles attached to copper pipes or flexible metal piping.

2. Locate the star-shaped apertures on the shower base plate. Use your hex key to turn each of these counterclockwise several turns until the base plate is loose enough to remove. Remove the baseplate, you may need to use the screwdriver to help pry the base plate off of the wall if there is excessive sealant. This will reveal the cartridge and internal wall pipes.

3. Attach your adjustable wrench to the cartridge system, turning it half a turn counterclockwise to unlock it. Remove the old cartridge.

4. Insert the 1224 replacement cartridge into the slot in the wall. Use your adjustable wrench to turn the cartridge clockwise half a turn to lock it into place. You will hear a small clicking sound and be unable to wiggle it when it is successfully seated.

5. Tighten your base plate back into place by lining it back up to the wall and tightening it down using the hex key clockwise, several turns.

Tips & Warnings

• While your wall is open, inspect the copper pipes running through your wall for leaks. If there are leaks, identify where they are coming from and you can use the adjustable wrench to tighten the nuts that are leaking. If the tubing itself is leaking you may use silicon based sealant or plumbers putty to seal the leak.
• When your wall is open (after removing the base plate), you may see numerous bugs or rot inside your wall. Many professionals will spray the inside of your wall with bug killer. Always wear a mask if you suspect mold or intend to use bug spray inside your wall. You should also use a fan or have the windows open to prevent a build up of noxious fumes.

References

• Moen 1224 Cartridge Installation