I installed the new circuit board as instructed. Everything came on as advertised. The reason for changing the board is that it seemed that the salt reading in the pool was not accurate. After turning on the new circuit board the salt reading is 1900ppm. I have about a 15000 gal pool and have added 320 # of salt to water that had already been salted for the last 8 years. the reading has gone no higher than 1900. I have followed the instructions and recalibrated several times. The instant salt reading has never changed since the initial reading even when I added the second 4 bags of salt to the pool. Of course when I turn on the generator it shuts off because the salt reading is too low. Ant thoughts?