Lennox 70W20 – LB-90745AH Kit-ECM Module is a genuine OEM replacement component engineered to restore proper operation of Lennox ECM blower motors used in furnaces and air handlers. This ECM module kit serves as the electronic control portion of the motor assembly, regulating variable speed operation to ensure consistent airflow, quiet performance, and improved energy efficiency.
Designed and manufactured to original Lennox specifications, the 70W20 ECM module kit provides precise motor control and dependable communication with the HVAC system’s control board. Replacing a failed ECM module can resolve common issues such as intermittent blower operation, incorrect airflow, fault codes related to motor communication, or complete blower failure.
This OEM ECM module kit is intended for use with compatible Lennox variable-speed blower motors and is commonly installed during professional HVAC service or repair. Using a factory-authorized module helps maintain system reliability, proper airflow balance, and manufacturer-intended performance.
Product highlights:
• Genuine Lennox OEM ECM module kit
• Part number 70W20 / LB-90745AH
• Restores variable-speed blower motor control
• Helps improve airflow consistency and system efficiency
• Designed for Lennox furnaces and air handlers with ECM motors
• Ideal for professional HVAC repair and maintenance
Compatibility and installation:
The Lennox 70W20 ECM Module Kit is designed for specific Lennox blower motor applications. Compatibility should always be verified by model and serial number before ordering. Professional installation is strongly recommended, as ECM modules are sensitive electronic components that require proper handling and setup.
Application:
Used in residential and light commercial HVAC systems where precise blower motor speed control is required for heating, cooling, and airflow management.
Condition:
New, unused OEM replacement part.
This Lennox 70W20 ECM module kit is an essential solution for restoring proper blower performance and extending the service life of Lennox HVAC systems while maintaining factory-level reliability and efficiency.