50M56U-801 – CONTROL BOARD (LENNOX, AFTERMARKET)
$200.4150M56U-801 aftermarket control board for Lennox single-stage furnaces. Replaces 103085 series, 100973 series, and many Lennox/Ducane/Armstrong boards.
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81W03 – CONTROL BOARD*
$225.16Lennox 81W03 ignition control board. OEM replacement for Lennox furnaces. Manages ignition sequence and heating cycles. Replaces 75M17 and 78M47.
