21V51U-843 – CONTROL BOARD (2-STAGE, ECM)

If your furnace won’t ignite, shows error codes, or the blower won’t start, the control board controls all of it. The 21V51U-843 is a universal 2-stage ECM furnace control that replaces over 500 OEM boards across multiple brands.

Specs: 2-stage, ECM motor compatible, universal integrated furnace control, LED diagnostics, by White-Rodgers

Replaces: 100870-01, 100870-03, 18M99, 19W60, 20300002, 20300004, 20300006, 20300006S, 21V51U-843, 449572, 49M59, 50V51-243, 50V51-288, 50V51-289, 50V51-290, 50V51-507, 50V61-120, 50V61-143, 50V61-288, 50V61-289, 50V61-480, 50V61-486, 50V61-507, 63W27, 642768, AMV80905CXBA, B1809925, B1809927, B1809927S, CNT03078, CNT04018, CNT04352, CNT05120, CNT06015, CNT6015, D156245P01, D341420P02, D34142P01, KIT15815, PCB00106, PCBBF106, PCBBF107S, PCBBF124S, S1-03102955000, S1-03102977000, S1-33102955000, S1-33102977000, SL280UH110V60C-01, X13650840010, Y4152

Fits: Universal — most 2-stage ECM furnaces. Lennox: 18M99, 19W60, 49M59; and others

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:

• 100870-01
• 100870-03
• 18M99
• 19W60
• 20300002
• 20300004
• 20300006
• 20300006S
• 449572
• 49M59
• 50V51-243
• 50V51-288
• 50V51-289
• 50V51-290
• 50V51-507
• 50V61-120
• 50V61-143
• 50V61-288
• 50V61-289
• 50V61-480
• 50V61-486
• 50V61-507
• 63W27
• 642768
• AMV80905CXBA
• B1809925
• B1809927
• B1809927S
• CNT03078
• CNT04018
• CNT04352
• CNT05120
• CNT06015
• CNT6015
• D156245P01
• D341420P02
• D34142P01
• KIT15815
• PCB00106
• PCBBF106
• PCBBF107S
• PCBBF124S
• S1-03102955000
• S1-03102977000
• S1-33102955000
• S1-33102977000
• X13650840010
• Y4152

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

Fits these models

• SL280UH110V60C-01