This is a Honeywell replacement for the Honeywell ST9160B control board and most ST9101, ST9120, ST9141 or ST9160 boards (see instructions for all applications). ST9120B (ST9120U1011) is an upgraded board. This seller had a very good price and is easy to install. If you have no experience, just read the instructions carefully. Instructions are available online, PDF file: Honeywell_ST120U_69-2252EF.pdf.
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