Quick answer
Use a sink parts diagram to locate and identify components like the faucet, drain, and P-trap. Turn off the water supply before disassembling. Replace worn parts such as washers or O-rings to fix leaks.
Confirm the symptom
- Leaking water from the faucet or drain
- Slow draining water
- Faucet handle is loose or hard to turn
- Visible cracks or damage to the sink basin
- Unusual noises from the pipes when using the sink
Tools and prep
- Adjustable wrench
- Plumber's putty or silicone sealant
- Replacement parts (washers, O-rings, cartridges)
- Bucket or towel to catch water
- Flashlight for better visibility
- Turn off the water supply before starting
Step-by-step troubleshooting
- Turn Off Water SupplyDo: Locate and turn off the shut-off valves under the sink.Observe: Water stops flowing from the faucet.Means: Valves are correctly closed.Next: Inspect the sink components.
- Inspect the Sink ComponentsDo: Use a flashlight to examine the faucet, drain, and P-trap for visible damage or wear.Observe: Identify any cracked parts, corrosion, or worn washers.Means: You can determine which parts need replacement.Next: Disassemble the faucet if necessary.
- Disassemble the FaucetDo: Use an adjustable wrench to remove the faucet handle and cartridge.Observe: Handle and cartridge come loose without resistance.Means: Components are accessible for inspection.Next: Check for worn washers or O-rings.
- Check for Worn Washers or O-RingsDo: Inspect the washer under the cartridge and the O-ring around the valve seat.Observe: Washers or O-rings show signs of wear or cracking.Means: Leakage is likely due to these components.Next: Replace damaged parts.
- Replace Damaged PartsDo: Install new washers or O-rings, and reassemble the faucet.Observe: Components fit snugly and without gaps.Means: Leakage should be resolved.Next: Test the sink for leaks.
- Test the Sink for LeaksDo: Turn the water supply back on and run the faucet.Observe: No water leaks from the faucet or drain.Means: Repair was successful.Next: Monitor for recurring issues.
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Worn Washer or O-Ring These parts degrade over time, causing leaks. | Common | Easy | Washer, O-ring |
| Clogged Drain or P-Trap Hair and debris accumulate, slowing drainage. | Common | Easy | Drain strainer, P-trap cleaning tool |
| Loose or Damaged Faucet Handle Handle screws loosen or the handle cracks. | Sometimes | Easy | Faucet handle, screw |
| Faulty Cartridge The cartridge inside the faucet wears out, causing leaks. | Sometimes | Medium | Faucet cartridge |
| Corroded Valve Seat Mineral buildup damages the valve seat, leading to leaks. | Rare | Medium | Valve seat tool, replacement seat |
| Cracked Sink Basin Impact or age causes cracks, leading to leaks. | Rare | Hard | Epoxy repair kit or replacement sink |
Parts matching
Match your sink's components to common parts for accurate repairs:
- Faucet Handle: Controls water flow and temperature
- Cartridge: Seals water flow inside the faucet
- Washer/O-Ring: Prevents leaks at connection points
- P-Trap: Prevents sewer gases from entering the home
- Drain Strainer: Catches debris to prevent clogs
Keep a sink parts diagram handy to identify each component before disassembling.
When to call a professional
- Leak persists after replacing washers and O-rings
- Faucet requires cartridge replacement beyond your comfort level
- Sink basin is cracked and needs professional repair or replacement
- Persistent clogs that won't clear with a plunger or snake
- Unusual water pressure issues after repairs
FAQ
How do I find a sink parts diagram?
Check the manufacturer's website or contact their customer support for a diagram specific to your sink model.
Can I replace a sink faucet myself?
Yes, if you have basic tools and follow the manufacturer's instructions. Turn off the water supply before starting.
Why is my sink still leaking after replacing the washer?
The O-ring or cartridge might also be damaged. Inspect and replace these parts if necessary.
What tools do I need to fix a leaky sink?
You'll need an adjustable wrench, replacement washers/O-rings, plumber's putty, and a flashlight for visibility.
How often should I check my sink for leaks?
Inspect your sink monthly for leaks or clogs, especially under the sink where components are more prone to wear.