Sink tap not turning on fully?

If your sink tap isn't turning on fully, it could be due to several reasons, such as a clogged aerator or a problem with the faucet cartridge. Start by checking the aerator for debris and clean it if necessary. If the issue persists, you may need to inspect the faucet cartridge for wear or damage, which may require replacement. Additionally, ensure that the water supply valves under the sink are fully open.