Precision Actuation: Calibrated at 1

This model is a direct cross-reference for 1372125 and 21-513

By utilizing integrated micro-controllers

using a genuine Lennox 15M20 pressure switch ensures your system maintains factory-spec safety parameters and optimal airflow monitoring

If the stem moves freely but the flow is blocked

Lennox 56M61 Circuit Board R-410A Precision Actuation: Calibrated at 1The Lennox 56M61 is a genuine OEM ignition control circuit board designed for high performance residential and commercial HVAC units. Operating at 208 240V, this board serves as the primary intelligence for the heating ignition sequence, precisely managing the flame sensor feedback, gas valve calibration, and induction blower timing. As a direct Lennox replacement part, it eliminates the communication errors and voltage fluctuations often associated