podymfd

I've retrofit an older swimspa with a new bp2000g1. I've also installed a new tp900 topside to control it. All wiring is correct and verified. When the system starts up in prime mode, all my pumps are visible and work correctly. Once I exit prime mode, pumps 3 and 4 (connected to the extender board) disappear. I can rotate which pumps are plugged in where and the issue follows the extender. I can't find any information about menu programming that needs done. All paperwork says the display will show "all available accessories". Presently, the unit is running in mode 7 2spd,1spd,1spd,1spd. I've tried other modes, with the same results. Thoughts? Thanks in advance, Matt