OK, so I was running through the menus on my controller, and the pump was off (cell not generating). For some reason the salt level was showing 0PPM, whereas earlier it had been showing 2900. Was thinking about shutting it down and adding some salt, but I couldn't figure why it was saying 0ppm (hadn't seen that before). So like a dope, I pressed the plus key which is "record", and now I'm getting "check system", salt low.
****, what in the **** did I do?
Hayward T Cell with ProLogic 4 automation.