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The Lennox 30W87 is a genuine OEM Defrost Control Board (also referenced as 100269-01) that regulates the defrost cycle in compatible Lennox heat pump systems, preventing ice buildup on the outdoor coil. Signs of a failing defrost board include the outdoor unit freezing over, the system running continuously in defrost mode, or the heat pump failing to maintain set temperatures. This direct OEM replacement ensures compatibility and restores proper defrost operation to your Lennox system.