How to Replace a Broken Faucet Cartridge

A broken faucet cartridge can cause a dripping faucet, inconsistent water temperature, or difficulty in controlling water flow. Replacing the cartridge is a straightforward repair that can save you money on plumber fees and prevent further water damage. In this article, we will guide you through the step-by-step process of replacing a broken faucet cartridge, covering the tools needed, identifying the cartridge type, and ensuring a smooth installation.

What Is a Faucet Cartridge?

A faucet cartridge is an internal valve mechanism that controls water flow and temperature by regulating how much hot and cold water mix as you turn the faucet handle. It’s found inside single-handle faucets and some two-handle models. Cartridges come in various designs depending on the manufacturer and faucet model.

When a cartridge wears out or breaks, you may experience issues such as leaks, difficulty turning the handle, or inconsistent water pressure. Replacing the faulty cartridge restores your faucet’s function without requiring a complete faucet replacement.

Tools and Materials You Will Need

Before starting the replacement process, gather these tools and materials:

• Adjustable wrench or basin wrench
• Screwdrivers (flathead and Phillips)
• Allen wrench (hex key set)
• Pliers
• Replacement faucet cartridge (make sure it matches your faucet model)
• Plumber’s grease or silicone grease
• Rag or towel
• Bucket or small container (to catch any dripping water)
• WD-40 or penetrating oil (optional for stuck parts)

Having these ready will make the job more efficient and prevent interruptions during the repair.

Step 1: Turn Off the Water Supply

Safety first—begin by shutting off the water supply to your faucet to prevent flooding. Look under your sink for two shut-off valves (one for hot water and one for cold).

1. Turn both valves clockwise to close them.
2. Open the faucet handles to drain any remaining water in the lines and relieve pressure.
3. If there are no shut-off valves under your sink, you’ll need to turn off the main water supply for your home.

Make sure the water is fully turned off before proceeding.

Step 2: Plug the Drain

Small parts such as screws or washers can easily fall into your drain during disassembly. Use a drain plug or simply cover the drain with a rag or towel to prevent losing any components.

Step 3: Remove the Faucet Handle

The handle may be secured with:

• A decorative cap hiding a screw
• A visible screw beneath or behind the handle
• A hex screw on the side of the handle

Follow these steps:

1. Pry off any decorative caps using a flathead screwdriver carefully to avoid scratching.
2. Locate and remove screws with an appropriate screwdriver or Allen wrench.
3. Once screws are removed, pull the handle straight up or gently wiggle it until it comes off.

If it’s stuck due to mineral build-up, apply some penetrating oil like WD-40 and let it sit for a few minutes before trying again.

Step 4: Remove Retaining Components

With the handle off, you will see other parts such as:

• A retaining nut holding the cartridge in place
• A clip securing the cartridge

Use an adjustable wrench to unscrew the retaining nut by turning counterclockwise. Keep all removed parts organized for reassembly.

If your faucet has a clip, use needle-nose pliers to pull it out carefully.

Step 5: Extract the Old Cartridge

Gently pull out the old cartridge from its housing:

• Grasp it firmly by hand or use pliers if it’s tight (use cloth around pliers jaws to avoid damaging cartridge).
• Sometimes there is a plastic pull tab on top of cartridges—if present, use it to help remove.

Do not force excessively; if stuck, apply some lubricant and wiggle slightly until it loosens.

Step 6: Identify Your Cartridge Type

For accurate replacement, identify your cartridge type:

• Check for any model numbers or markings on the old cartridge.
• Take photos and match them with replacement cartridges at hardware stores or online retailers.
• Bring old cartridge along when shopping if unsure.

Using an incorrect cartridge can cause leaks or malfunctioning faucets.

Step 7: Prepare New Cartridge for Installation

Before inserting:

1. Compare new cartridge with old one to ensure they match exactly in shape, size, and ports.
2. Apply plumber’s grease lightly on O-rings and seals—this helps create a watertight seal and eases future removal. Avoid using petroleum jelly as it can degrade rubber parts.

Step 8: Install New Cartridge

Insert new cartridge into faucet body carefully aligning any tabs or notches:

• Ensure it fits flush without forcing.
• Replace any retaining clips if applicable.
• Screw retaining nut back in place snugly but do not overtighten as this may crack plastic components.

Double-check alignment; improper seating can cause leaks.

Step 9: Reassemble Faucet Handle

Put back all parts removed earlier:

1. Place handle onto cartridge stem properly aligned.
2. Screw in handle screws.
3. Snap on decorative caps if present.

Test that handle moves smoothly up/down or side-to-side depending on model.

Step 10: Turn Water Supply Back On and Test

1. Slowly turn open shut-off valves under sink by rotating counterclockwise.
2. Check carefully for leaks around base of handle and under sink.
3. Turn faucet on/off and test hot/cold mixing to ensure smooth operation without drips.
4. If you notice leaks, tighten retaining nut slightly more; if leaking persists, check alignment again.

Tips for Success and Maintenance

• Keep your faucet model number handy for future repairs—this is usually found under sink or on packaging/manuals.
• Regular cleaning of aerators prevents buildup that may affect performance.
• Consider replacing seats and springs along with cartridges if leaks continue.
• Avoid using excessive force when operating handles; gentle turns prolong cartridge life.
• If unsure about any step or if issues persist after replacement, consult a professional plumber.

Conclusion

Replacing a broken faucet cartridge is an achievable DIY task that can restore your faucet’s proper function quickly and affordably. By following these detailed steps—from shutting off water supply to correctly installing a new cartridge—you’ll enjoy drip-free operation and improved control over your kitchen or bathroom tap.

With patience and attention to detail, even beginners can tackle this common plumbing repair confidently without calling in professional help!