We set up the OnComand System and AquaRite Clorinator on February 2013 on an in ground 20000 Gl. pool, since then already the variable speed pump was replaced about 2 years ago and the AquaRite PCB 6-month after both under guaranty.
I do have a LaMotte 2056 ColorQ that I have been using for about 2 years and also periodically, when in any doubt, I take a water sample to the local pool supply store, both readings were always equal some and very close others.
At the beginning of the 2016 season I noticed some discrepancies with our readings and after taking a sample to the pool store I found out that both tests indicate that the salt level was too high 4100, 3900; and our display reading was 2400;
I was advised by the pool supply store to replace with fresh water about 2í of water, by the way our pool holds 20000 gallons, after doing that we have 3600/3650, on our reading and pool store.
After reading the forums I feel the need to recalibrate the unit to correct the 2400 wrong reading and it was impossible the digital display is acting up again, it was showing very erratic readings constantly changing, when pressing the diagnostic button, it does not make changes and most of the time remains on 80 that I assume is the temperature.
Is possible that the PCB or Display is bad again and not responding or the cell is failing and cause those problems?
Thanks for your help