Amana/Goodman B1809923S 2 Stage HSI Board is the OEM control board for Goodman Amana units. Control board is the brain of your Amana Goodman unit. It controls almost everything inside your unit to make sure it runs safely and efficiently. All control boards are Amana Goodman OEM and tested before shipping out from the factory. For Use With Model Series: GSM (All) Replaces: B1809923