Lennox 56M61 Circuit Board R-410A this is a safety relief

this is a safety relief valve designed for emergency pressure discharge only

securing the long-term operational efficiency of liquid and suction line applications

protecting the heat exchanger from improper combustion conditions

this specific control is designed for 24 VAC (18-30 VAC) input only

Operating on a standard 24VAC control circuit

Lennox 56M61 Circuit Board R-410A this is a safety reliefThe 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