Before replacing the board, count the LED blinks — the error code tells you what actually failed. Sometimes it’s a $15 fuse, not a $140 board.
21V51U-843 – CONTROL BOARD (2-STAGE, ECM)
$349.05
White-Rodgers 21V51U-843 universal 2-stage furnace control board for ECM motors. Replaces 500+ OEM boards. Built-in diagnostics with LED error codes.
Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm | In-Store Pickup Only
Description
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.
