Emerson 21D83M-843 Integrated Furnace Control Kit Review Posted by Caterpixie July 18, 2018 in Household Fans Includes Diagnostic Indicator Flash Codes, 3 Fan Speeds, Remote Flame Sense, White-Rodgers 21D83M-843 Control Board for Lennox 83M00. Made in United States. Manufactured by White Rodgers. Cooling & Air Quality Emerson Heating Home & Kitchen Household Fans