Thanks for the great work and hints about reverse engineering.
I own a poolex 120 heat pump with similar controller. However I can't find the same traces using SigRok (and I'm having troubles guessing the baud rate -> framing errors in all cases). My SigRok capture between heat pump and controller (A hooked on D1 + B on D2 + GND) is attached to this "issue". Let me know if we can get in touch to figure this out !
PAC.sr.zip