50M56U-801 – CONTROL BOARD (LENNOX, AFTERMARKET)

If your furnace won’t ignite, shows error codes, or the blower won’t start, the control board controls all of it. The 50M56U-801 is an aftermarket integrated furnace control that replaces a wide range of Lennox, Ducane, and Armstrong single-stage furnace boards. Manages ignition, blower control, and all safety functions.

Specs: Aftermarket integrated furnace control, single-stage, LED diagnostics

Replaces: 100973-01, 100973-02, 1012-83-9673A, 1012-967, 1012-968, 1012-969, 1012-969A, 1012-977A, 103085-01, 103085-02, 103085-03, 103098-01, 1195-100, 1195-83-100A, 12L42, 12L4201, 17W70, 2054990, 50A55-120, 56L85, 56L8501, 56W19, 74W03, 75M17, 75M1701, 78M17, 78M1701, 78M47, 78M4701, 80M27, 80M2701, 81W03, 81W11, 94W83, AF80MPA100B5B, R47582-001

Fits: Lennox, Ducane, and Armstrong single-stage gas furnaces

Need help? See our Furnace Not Heating Guide.

In stock at Open To Public HVAC Parts in Dallas. We test parts at the counter before you buy. Call or text (214) 340-9421.

Cross-reference numbers

This part replaces the following OEM and aftermarket numbers:

• 100973-01
• 100973-02
• 1012-83-9673A
• 1012-967
• 1012-968
• 1012-969
• 1012-969A
• 1012-977A
• 103085-01
• 103085-02
• 103085-03
• 103098-01
• 1195-100
• 1195-83-100A
• 12L42
• 12L4201
• 17W70
• 2054990
• 50A55-120
• 56L85
• 56L8501
• 56W19
• 74W03
• 75M17
• 75M1701
• 78M17
• 78M1701
• 78M47
• 78M4701
• 80M27
• 80M2701
• 81W03
• 81W11
• 94W83
• AF80MPA100B5B
• R47582-001

Not sure if your number matches? Call (214) 340-9421 or bring the old part in — bench-testing is free.