I am having the exact same problems. I just installed a new pcb board last week and everything was fine until two days ago when the instant salt reading was 200 but now I get a 0 reading on my instant salt. I went through the re-calibration steps but to no prevail. I also threw the breaker in hopes of a reset, no go. My unit is 5 years old and the guy at the pool store today told me that units in the Houston area get 2-3 years of life due to the 15 hrs of work at 100%. But you see I don't trust those guys in pool stores, that's why I am here. I really can't get an answer from Goldline either other than call a tech, not in this economy when I am just as capable if not more. Any help would be great. I am thinking an inline chlorinator might be the remedy!