To stop a malfunctioning sink sprayer from leaking or spraying water uncontrollably, you must isolate the issue at the diverter valve or spray head. If the side sprayer leaks constantly while the main spout is running, the internal diverter valve inside the faucet body is stuck or worn out, failing to close completely. Unscrew the sprayer head from its hose and inspect the trigger valve for mineral scale or jamming. Callout type="warning" title="Hygiene Warning": Shut off the water supply under the sink before servicing sprayer connections. Verification: Test the main faucet to ensure water flows exclusively through the spout without leaking into the sprayer hose.
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