performing reliably across ambient temperatures from -40° to 205°F

internal clearances and stem assembly lengths vary

prioritizing the protection of the compressor crankcase

check your specific manual to confirm 100165920 is the listed part number

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Lennox 15D55 Control Board 322838-752 performing reliably across ambient temperaturesThe Lennox 15D55 Defrost Control Board is a critical OEM replacement component engineered to manage the complex defrost cycles of Lennox heat pump systems. As a veteran technician knows, maintaining the integrity of the outdoor coil is paramount; this board utilizes advanced demand defrost logic to monitor coil and ambient sensors, preventing efficiency robbing frost buildup. With high temp ratings up to 105C and a robust 47F capacitance, the Lennox