Hi,
Loosing my mind with what seem to be an electrical problem. Since one week I have no power and I checked breaker, GFI, fuse, change power supply, and also change the board (CS5000) and the control panel but I get the same result.
Pretty similar issue already posted in the past (2013), but don't know how it was solved:
https://www.poolspaforum.com/forum/index.php?/topic/45096-weird-cal-spa-electrical-problem-has-me-stumped/#comment-173370