Common symptoms of a failing or faulty faucet diverter valve include water continuing to spray out of the side sprayer or pull-down wand even when you are trying to use the main spout, water trickling weakly out of both the spout and sprayer simultaneously, or a noticeable drop in water pressure at the main spout when the sprayer is inactive. When internal rubber seals degrade or mineral scale jams the valve, water fails to redirect cleanly. Verification: Inspect the water flow during operation to confirm whether water switches completely between the spout and sprayer without cross-leaking.
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