Step-by-step fix
Step 1: Make sure the cartridge is the likely problem
- Look for symptoms that point to the cartridge: dripping from the spout when the faucet is off, a handle that is hard to move, poor temperature control, or weak flow from only the hot or cold side.
- Check that the leak is not clearly coming from the supply lines, sprayer hose, or faucet base seams below the handle area.
- Open and close the faucet a few times to confirm the problem happens at the control point, not just at the aerator.
- If you already have the replacement part, compare it to the faucet style and make sure it appears to match the original type before taking the faucet apart.
If it works: The symptoms fit a worn or sticking kitchen faucet cartridge, and replacing it is a reasonable next step.
If it doesn’t: If water is leaking from a supply connection, the sprayer hose, or under the sink instead of through the faucet control, diagnose that leak source first.
Stop if:- The faucet body is cracked, badly corroded, or loose at the sink deck.
- The shutoff valves under the sink do not fully close or start leaking when touched.
- You cannot identify a matching replacement cartridge for the faucet.
Step 2: Shut off the water and set up the work area
- Clear out the cabinet under the sink so you can reach the shutoff valves easily.
- Turn off both hot and cold shutoff valves under the sink by turning them clockwise until they stop.
- Open the faucet to relieve pressure and confirm the water is off. Leave the handle in the open position for a moment until flow stops.
- Put a towel in the sink and another under the faucet area or in the cabinet to catch leftover water and protect finishes.
- Close the sink drain or cover it so small screws and clips cannot fall in.
If it works: The water is off, pressure is relieved, and the area is protected for disassembly.
If it doesn’t: If a shutoff valve will not close fully, shut off the home's water supply before continuing.
Stop if:- A shutoff valve leaks steadily from the stem or body when you operate it.
- Water continues flowing strongly from the faucet after both local shutoffs are closed.
Step 3: Remove the handle and retaining parts
- Pry off the decorative cap if there is one, or locate the small set screw on the handle.
- Remove the handle screw with a screwdriver or Allen key, then lift the handle off.
- Unscrew or lift off any trim sleeve, bonnet cap, or decorative cover to expose the cartridge retaining nut or clip.
- Remove the retaining nut, collar, or clip carefully and set the parts down in the order they came off.
- Take a quick photo before pulling the cartridge so you can match the original orientation during reassembly.
If it works: The cartridge is exposed and ready to come out, with the retaining hardware removed and organized.
If it doesn’t: If mineral buildup is locking parts in place, apply steady pressure and work slowly rather than twisting hard enough to crack trim or the faucet body.
Stop if:- The faucet body starts flexing, cracking, or turning in the sink while you loosen retaining parts.
- A hidden clip or fastener will not release and forcing it would damage the faucet.
Step 4: Pull out the old cartridge and clean the valve body
- Grip the cartridge stem and pull straight up, or rock it gently side to side while lifting if it is snug.
- Use a cartridge puller if the cartridge is stuck and will not come free by hand.
- Once removed, compare the old cartridge to the new one for stem shape, length, ports, and seal placement.
- Wipe out the valve body with a clean cloth to remove grit, scale, or rubber debris.
- Check that old seals or fragments are not left behind in the faucet body.
If it works: The old cartridge is out, the valve body is clean, and the new cartridge matches the original.
If it doesn’t: If the new cartridge does not match exactly enough to seat the same way, pause and get the correct replacement before reassembling.
Stop if:- The cartridge breaks apart and pieces remain stuck deep in the valve body.
- The inside of the faucet body is cracked, heavily pitted, or damaged where the cartridge seals.
Step 5: Install the new cartridge in the same orientation
- Apply a very light coat of silicone plumber's grease to the new cartridge seals if they are dry. Do not pack the cavity with grease.
- Align the tabs, flats, or locating features so the new cartridge goes in the same direction as the old one.
- Press the cartridge fully into place until it seats evenly.
- Reinstall the retaining clip, nut, or collar and tighten it snugly without overtightening.
- Reinstall the trim and handle, then secure the handle screw and snap the cap back on if used.
If it works: The new cartridge is fully seated, the retaining hardware is secure, and the handle is back on.
If it doesn’t: If the handle position looks wrong or the cartridge will not seat fully, remove it and realign it instead of forcing the retaining nut down.
Stop if:- The retaining nut will not thread on smoothly, which can mean the cartridge is misaligned or cross-threaded.
- The new cartridge sits crooked or pops back up instead of staying seated.
Step 6: Turn the water back on and verify the repair holds
- Make sure the faucet is in the off position.
- Open the hot and cold shutoff valves slowly under the sink.
- Watch the faucet body, handle area, and under-sink connections for leaks as pressure returns.
- Run the faucet on hot, cold, and mixed settings. Move the handle through its full range to check for smooth motion and normal flow.
- Turn the faucet off and wait a few minutes to confirm the spout no longer drips and no seepage appears around the handle or under the sink.
If it works: The faucet operates smoothly, flow and temperature control are normal, and the leak or cartridge-related problem is gone.
If it doesn’t: If the faucet still drips, binds, or has poor flow on one side, recheck cartridge orientation, make sure the correct part was installed, and inspect the aerator for debris loosened during the repair.
Stop if:- Water leaks from the faucet body or under the sink after reassembly and does not stop with a gentle retightening of accessible parts.
- The faucet still has the same symptom after a correct cartridge replacement, suggesting a different internal fault or the wrong diagnosis.
Replacement Parts
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FAQ
What does a bad kitchen faucet cartridge usually cause?
Common signs are dripping from the spout, a handle that is hard to move, poor hot-cold mixing, or weak flow from one side of the faucet.
Do I need the exact same cartridge?
Yes. The replacement needs to match the original cartridge's stem shape, length, ports, seal locations, and overall fit. A close-looking part is not always close enough.
What if the old cartridge is stuck?
Mineral buildup often locks cartridges in place. Remove all retaining hardware first, then pull straight up while rocking gently. A cartridge puller can help. Stop if the faucet body starts to crack or twist.
Should I use plumber's grease on the new cartridge?
A light film of silicone plumber's grease on the seals can help the cartridge slide in and seat properly. Do not use too much, and avoid non-silicone grease unless the part instructions specifically allow it.
Why is the faucet still dripping after I replaced the cartridge?
The new cartridge may be misaligned, not fully seated, or not the correct part. Debris in the valve body can also keep seals from closing properly. If everything is correct and it still drips, the faucet body may have internal wear.