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The Lennox 17A09 is a genuine OEM solenoid valve that uses electromagnetic actuation to automatically control the flow of refrigerant or fluid within Lennox heating and cooling systems. A faulty solenoid valve may cause symptoms such as the system failing to switch modes, refrigerant flow issues, unusual clicking sounds, or a complete loss of heating or cooling capacity. This factory-approved Lennox OEM replacement guarantees compatibility and restores proper automated flow control to your system.