I have a 700 AquaPure, and last week got the same error code, 145, salinity button showed HH, and temperature button showed 70 degrees. The pool tech told me that when the salinity button is showing HH, and the temperature is showing the temperature, then the computer interface board should be replaced. If the salinity button is showing HH and the temperature button is showing "--", then the sensor should be replaced. He replaced the green computer interface board and fixed the problem. However, it only lasted one week, and I am showing the same code, 145, HH, and the temperature. I tried holding down the recalibration button on the daughter board, didn't do anything. If anyone has any suggestions on trying anything different than replacing the computer interface board again, I'd love to hear them. Thanks.