The manual says: "NOTE:If PGM2 is programmed for 2-wire smoke support, the connector JP1 on the main board must be removed." Since they say "must," you kinda have to do it! There's only one jumper on the board, and according to the diagram, it's right above the GRN terminal. It's a tiny black plastic square.... you might find it easier to use tweezers to remove it. ALSO.... if you are using 2-wire smokes, they are NOT programmed as a zone. They are wired as you wired them, to AUX+ and PGM2, and PGM2 is set as 04 (2 wire smoke support). It is not meant to be Zone 4.