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The Lennox 15T83 is a factory OEM Module (102993-09) specifically designed for use with Lennox CBX25-48 and BCE3M48 air handler units, providing essential control and communication functions within the system. Symptoms of a failing module include loss of system communication, improper unit operation, or failure to respond to thermostat commands. This genuine Lennox replacement module installs directly into compatible units, restoring full and reliable system operation.