Quick answer
To fix a sink kitchen unit, first turn off the water supply and check for leaks or loose connections. Tighten fittings or replace worn washers. If the issue persists, inspect the faucet and drain assembly for damage.
Confirm the symptom
- Water leaking from the sink base or under the counter
- Faucet drips even when turned off
- Sink drain clogged or slow to drain
- Unusual noises from the sink unit when water is running
- Sink feels wobbly or unstable
Tools and prep
- Adjustable wrench
- Plumber's putty or silicone sealant
- Replacement washers or O-rings
- Bucket or towel to catch water
- Screwdrivers (flathead and Phillips)
- Turn off water supply under the sink before starting
- Wear rubber gloves to protect hands
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: Water supply is safely isolated.Next: Inspect connections
- Inspect ConnectionsDo: Check all water supply lines and fittings for leaks or corrosion.Observe: Visible leaks or damaged parts.Means: Leak source identified.Next: Tighten or replace fittings
- Tighten or Replace FittingsDo: Use an adjustable wrench to tighten loose connections. Replace worn washers or O-rings if damaged.Observe: Connections are secure and no longer leaking.Means: Leak repaired.Next: Test water supply
- Test Water SupplyDo: Slowly turn on the water supply valves and check for leaks.Observe: No new leaks appear.Means: Repair successful.Next: Monitor for recurring issues
- Check Faucet and DrainDo: Inspect the faucet for cracks or worn seals. Clear any clogs in the drain.Observe: Faucet and drain appear intact and functional.Means: No further immediate action needed.Next: Final inspection
- Final InspectionDo: Run water through the sink and observe for leaks or unusual noises.Observe: Sink operates normally without leaks.Means: Issue resolved.Next: Complete
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Loose or damaged fittings Over time, vibrations and temperature changes can loosen connections or wear out seals. | Common | Easy | Washers, O-rings |
| Clogged drain Food particles and grease can accumulate and block the drain. | Common | Easy–Medium | Drain strainer, plunger |
| Faulty faucet cartridge Worn or damaged internal components can cause leaks or drips. | Sometimes | Medium | Faucet cartridge |
| Corroded water supply lines Mineral buildup or age can corrode metal lines, leading to leaks. | Sometimes | Medium | Supply line replacement |
| Improper installation Incorrect assembly during installation can lead to leaks or instability. | Rare | Easy–Medium | Sealant, mounting hardware |
| Worn gasket under sink The gasket between the sink and countertop can degrade over time. | Sometimes | Medium | Sink gasket |
Parts matching
Common parts needed for sink kitchen unit repairs include:
- Washers and O-rings for sealing connections
- Faucet cartridge for internal components
- Drain strainer and plunger for clog removal
- Plumber's putty or silicone sealant for resealing
- Replacement supply lines if corroded
- Sink gasket for a secure fit under the countertop
Purchase parts specific to your sink model for the best fit and performance.
When to call a professional
- Persistent leaks after tightening or replacing parts
- Visible cracks or damage to the sink body
- Complex issues like corroded supply lines requiring soldering
- If you're unsure about the repair process or lack the necessary tools
- Unusual noises that continue after inspection and testing
- Recurring clogs that suggest a deeper plumbing issue
FAQ
How do I know if my sink's faucet needs a new cartridge?
If your faucet drips when off or doesn't shut off completely, the cartridge is likely worn and needs replacement.
Can I use regular silicone sealant instead of plumber's putty?
Yes, but plumber's putty is more flexible and better suited for sealing under sinks. Use it for a durable, watertight seal.
Why is my sink making a whining noise when I run water?
A whining noise often indicates a restricted water flow, possibly due to a clogged aerator or supply line. Clean the aerator or check for blockages.
How often should I replace sink gaskets and seals?
Inspect every 1–2 years and replace if they show signs of wear or cracking to prevent leaks.
What should I do if the sink is wobbly?
Ensure the mounting hardware is secure. If the sink is still unstable, check the support brackets and tighten or replace as needed.