I have an AquaLink RS4 and AquaRite SWG, installed together in 2007 and they used to work together fine with the RS controlling all aspects of the SWG. But while running through the diagnostics on the AquaRite I inadvertently changed the emulation. I just changed the control board on the AquaRite and no matter what emulation I try or how many times I cycle the power or in what order, the AquaLink diagnostic menu shows "AquaRite (not compatible)." I've tried to find the revision on the back of the AquaLink board, but don't really know what to look for and no letter codes are jumping out at me. If it helps, the PDA shows "3.0" as the version for all the software.
Is the Aqualink now permanently stuck in this mode of not recognizing the SWG? Must I buy a replacement circuit board, and how can I have any confidence that a used board from Ebay won't be incompatible just like this one?