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The Lennox Y5016 (50041883-001) is a genuine OEM 24V AC solenoid valve designed for use with Lennox TrueEase whole-home humidifiers, where it automatically controls the flow of water into the humidifier during operation. A faulty solenoid valve may cause the humidifier to produce no humidity, continuously overflow, or fail to respond to thermostat or humidistat signals. This direct OEM replacement ensures proper water flow control and restores full humidifier functionality on compatible Lennox TrueEase systems.