White-Rodgers Furnace Controls SKU 21M51U-843 Please select UNIVERSAL 2 STAGE CONT BOARDUNIV 2-STAGE VS CONTROL BOARDCONTROL BOARD RPLC YORK/LXAIREALL SPARK UNVRSL IGNTN CONTROLUNIVERSAL FURNACE CNTRL BOARDELECTRIC HEAT SEQ 2 SWTCHELECTRIC HEAT SEQ 2 SWTCHELECTRIC HEAT SEQ 3 SWTCHSENSI LITE SMART THERMOSTATSENSI TOUCH 2 SMART THERMOSTATSENSI TOUCH 2 SMART THERMOSTATSENSI ROOM SENSOR Log in to view price