I have a jandy 1400 cellthat I bought last season to replace my previous 1400. 3 weeks ago I added salt because salt level was 2.8 gr/l on the display unit. That Raised the level to 3.5, worked great until 3 days ago, then it read high salt of 5.2 and error code "174", I thought this was a problem with the cell. I removed it and gave it a 4/1 acid soak for 10 minutes,then cleaned the sensor with plastic scrub pad. I took a sample to local pool supply, reading was 3.8. Started added water, and I ordered a oaktron saltester 11. Today the tester came in and water tested 3.1, but swg display is reading 4.2 and error code "174". Any ideas? Thanks