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Lennox 10T50 Equipment Interface Module Software ver. 1.10 New Open Box. Please see photos for details.

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The Lennox 10T50 Equipment Interface Module (EIM) is a hardware control board that allows a Lennox communicating thermostat (such as the iComfort series) to control conventional, non-communicating HVAC equipment. [1, 2]

Hardware and Firmware Verification

Software/Firmware Version 1.10: The software version printed on the barcode sticker or chips of this module indicates its factory-flashed firmware baseline. Version 1.10 is an earlier revision of this hardware module, whereas later batches of this exact catalog number shipped with versions like 1.90 or 2.1.
Part Numbers: The module is tracked under Catalog Number 10T50, part number 103861-02, or engineering model 1184-212. It has since been superseded in newer system installations by catalog number 22X18 (part number 103861-04). [1, 2, 3, 4, 5]

Core Functionality

System Translation: It translates serial communication signals from smart thermostats into standard 24VAC signals. This lets you run up to 3 stages of heating and 2 stages of cooling on traditional furnaces, air handlers, heat pumps, or air conditioners.
System Capabilities: Supports advanced features like the iHarmony Zoning System, Humiditrol Enhanced Dehumidification Accessories (EDA), dual-fuel configurations, and automated indoor air quality maintenance reminders.
Diagnostic LEDs: The module contains onboard LEDs used by technicians to verify active communication status, power, and diagnostic fault codes during installation or troubleshooting. [1, 2, 3, 4, 5]

Software Updates & Servicing

Thermostat Updates: The 10T50 itself does not update directly over Wi-Fi. Instead, major software update additions (such as Amazon Alexa or Google Assistant integrations) are pushed directly to the connected Lennox iComfort Thermostat.
Recommissioning: If you replace this module or experience errors tied to the firmware version, you must force a recommissioning cycle on your communicating thermostat menu to clear old hardware data maps. [1, 2]