Fixing a malfunctioning faucet diverter requires cleaning or replacing the internal valve. First, shut off the water supply valves under the sink. Access the diverter by removing the spout tip, handle assembly, or central plug depending on your specific faucet design. Clean away accumulated mineral scale with white vinegar or install a brand-new replacement diverter cartridge kit. Callout type="warning" title="Hygiene Warning": Shut off the water supply valves under the sink before disassembling plumbing fixtures. Verification: Test the faucet handle and sprayer to ensure water diverts properly without leaking.
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