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Quick answer
Turn off the water supply, check for clogs in the drain, and inspect the faucet. If the sink still doesn't work, test the water valves and look for leaks under the sink.
Confirm the symptom
- No water flows from the faucet
- Water drips but doesn't stop
- Drain is clogged and water won't go down
- Faucet handle is loose or broken
- Sink overflows even when not in use
Tools and prep
- Adjustable wrench
- Plunger
- Plumber's snake or drain auger
- Bucket or container
- Flashlight
- Replacement washers or O-rings
- Turn off water supply before starting repairs
- Wear rubber gloves to avoid contact with dirty water
Step-by-step troubleshooting
- Check Water Supply ValvesDo: Locate the shut-off valves under the sink and ensure they are fully open.Observe: Water flows freely from the faucet.Means: The valves were closed or partially closed.Next: If no water flows, proceed to the next step.
- Inspect Faucet AeratorDo: Unscrew the aerator at the tip of the faucet and clean any debris.Observe: Debris or mineral buildup is present.Means: Clogged aerator is restricting water flow.Next: Rinse the aerator and reattach it. If water still doesn't flow, continue to the next step.
- Test for Clogged DrainDo: Use a plunger to try to clear any blockages in the drain.Observe: Water drains slowly or not at all.Means: A clog is preventing proper drainage.Next: If plunging doesn't work, use a plumber's snake to clear the clog.
- Check for Leaks Under the SinkDo: Use a flashlight to inspect the pipes and connections under the sink for leaks or corrosion.Observe: Visible leaks or wet spots are found.Means: A leak is causing water to escape before reaching the faucet.Next: Tighten loose connections or replace damaged parts if necessary.
- Inspect Faucet Cartridge or ValveDo: Turn off the water supply and disassemble the faucet to check the cartridge or valve for wear or damage.Observe: Worn-out or damaged parts are found.Means: Faulty internal components are preventing proper water flow.Next: Replace the cartridge or valve with a new one.
- Test Water PressureDo: Check the water pressure at another faucet in the house to see if it's low.Observe: Low water pressure is consistent across multiple faucets.Means: The issue may be with the main water supply or pressure regulator.Next: Contact a professional plumber if the problem is widespread.
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Clogged Drain Hair, soap scum, or debris can block the drain. | Common | Easy | Plunger or plumber's snake |
| Closed Water Supply Valve The shut-off valve under the sink may be turned off. | Common | Easy | None |
| Clogged Faucet Aerator Mineral deposits can restrict water flow. | Common | Easy | Replacement aerator |
| Faulty Faucet Cartridge Wear and tear can cause internal components to fail. | Sometimes | Medium | Faucet cartridge |
| Leaking Pipes or Connections Corrosion or loose fittings can cause leaks. | Sometimes | Medium | Pipe repair kit or replacement parts |
| Low Water Pressure Issues with the main water supply or pressure regulator. | Rare | Hard | Professional inspection |
Parts matching
Common parts needed to fix a sink not working include:
- Plunger or plumber's snake for clearing clogs
- Replacement aerator for the faucet
- Faucet cartridge or valve kit
- Pipe repair kit or replacement washers/O-rings
- Shut-off valve if the existing one is faulty
Match the part to your sink model and ensure compatibility before purchasing.
When to call a professional
- Water continues to leak after tightening connections
- You can't identify the source of the problem
- The issue involves the main water supply or pressure regulator
- You're uncomfortable working with plumbing under the sink
- Damage is extensive and requires pipe replacement
FAQ
Why isn't any water coming out of my sink?
This could be due to a closed shut-off valve, a clogged aerator, or a problem with the main water supply.
How do I know if my sink's drain is clogged?
If water drains slowly or doesn't drain at all, the drain is likely clogged. Use a plunger or plumber's snake to clear it.
Can a faulty faucet cartridge cause low water pressure?
Yes, a worn-out or damaged faucet cartridge can restrict water flow and reduce pressure.
What should I do if my sink is leaking under the sink?
Inspect the pipes and connections for leaks. Tighten loose fittings or replace damaged parts as needed.
How often should I clean my sink's aerator?
It's recommended to clean the aerator every few months to prevent mineral buildup and maintain water flow.