When there's no water coming out of any tap or faucet in the home, it's pretty simple to determine that the problem is with the municipal supplier or there is a major water line break. However, it's a bit more challenging to determine the cause when only a single tap is affected, though.
1. Closed Valves
The first thing to check is the water valve below the affected sink. These valves can get turned off accidentally, typically when you bump the valve in the process of storing items under the sink. Some sinks have a single valve while others have both a hot and cold water control valve. Turn both valves to the left until they are fully open, then test the faucet to see if this solved the problem.
2. Blocked Aerator
Minerals in the water or pipe corrosion can lead to debris that blocks the faucet. This debris builds up behind the aerator screen inside the faucet head until it becomes too thick for water to easily pass through. On most faucets, it is relatively easy to remove the head of the spout to clean or replace the aerator screen. You can try soaking the screen in pure vinegar overnight, as the acid in the vinegar usually breaks up any residue.
3. Stuck Diverter Valve
Diverter valves are found on faucets that have a separate spout and spray attachment. This valve is what diverts the water from the tap spout to the sprayer when the sprayer is turned on. If your sprayer is working but no water comes from the faucet spout, then this valve is the likely culprit. The location of the valve varies by faucet design and manufacturer, but it is usually found in the spout or on the underside of the faucet. The valve will need to be loosened or replaced, depending on why it is stuck.
4. Broken Water Line
One of the worst causes to encounter is a break in the water line that feeds the faucet. Supply lines to a faucet typically run through the walls, so you may not be aware that water has been leaking and causing damage until it is severe enough to lead to a complete lack of water at the faucet. A plumber must locate the leak so it can be accessed for repair. Wet wallboard, water stains beneath the sink or on the wall, and the smell or sight of mildew are all signs of a water leak.
Contact a plumber in your area for more help with a malfunctioning faucet tap.