I have a Sundance 880 series (Marin) and am trying to accomplish the same thing. Any idea how I would find out if the control panel port is an I2C interface?
I have a 2003 Sundance Marin. My control board is faulty and needs replacing. I would also like to make use of the Cloud Control service that needs a 2010 or newer board.
Can I buy a 2010+ board and get it to work in my 2003 hot tub?