Experiencing two problems with newly-installed system consisting of a Pentair EasyTouch Controller, Intellichlor-20, and Intelliph.
I've spent an enormous amount of time troubleshooting this issue and am near my wits end. I've replaced the Intelliph controller and the problems remain. I've contacted Pentair and local pool contractors and have found no solution. In fact, neither Pentair nor 2 contractors claim they have ever seen this problem in spite of both of them being reported by others here on poolfyi.
1) When it is time for a dispense to occur, the Intelliph Controller will "hang" with the message "Checking Cell" and no dispense will occur. To clear the problem, power to the Intelliph Controller must be cycled. I have monitored and logged the RS-485 traffic between the Intelliph controller and the Intellichlor and see the same request/response messages between the two if the dispense happens properly or if it hangs. I have operated the Intelliph and Intellichlor independently from the rest of the EasyTouch system and the same thing happens. The hangs will usually happen one or more times a day, but sometimes it will work flawlessly for 3 days. This has happened since day 1 of the installation in August 2018 and continues to happen now in December 2018. (I've done a lot of work to collect data on this problem and a number of thing in an attempt to fix it without success - much more than I could discuss in a single post.) The problem does not appear to be correlated with temperature or exposure to direct sunlight on either the Acid Controller or the Intellichlor. In all cases the Intelliph Controller status LED remains green and there are no error conditions indicated on the Intellichor LEDs. Salt levels are normal (3000 to 3500 ppm), water flow is 45 gpm, and water temperature has always been greater than 63 degrees (I'm located in central Florida). Chlorine generation has been set to various values, all greater than 6%. Acid dispense is set to 17%.
2) On a much more infrequent basis - about once per month - the Intelliph Controller will turn on power to the acid pump at the correct time, but does not turn it off. This results in dumping the entire contents of the acid tank into pool. This too requires a power cycle to clear the problem. Also, the same "Checking Cell" message appears on the Intelliph Controller when this happens.
I've implemented a monitoring system that sets off an alarm if either of these conditions occur. I'm about to implement a watchdog circuit...but really, this system should just work. A neighbor has an Intellichlor and I'm planning on asking to borrow it to see if that has any effect on the problem.
Any help, suggestions, or input from your own similar experiences would be appreciated.