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Just wanted to let everyone know that the readings have held steadily correct since we swapped the probe caps. Thanks again, everyone!! :-) We're very grateful to all your input to help us resolve this odd problem.

UPDATE!! When I posted this last picture above, and looked at it on the desktop computer, I saw that the connectors to the board that were labeled pH and ORP were correctly hooked up. But, they also had colored tape on them!--blue for pH, and red for ORP. I said that's not what the colors are...

Heres a picture of it opened. Everything appears to be connected properly, and no visible scorch marks. However, I did notice a bakelite smell when I opened it. Now, there's always a bakelite smell when boards are new and the box had been closed up. So, it might just be that. OR, it might be...

Matt, that is correct. And that is definitely worth checking! Thanks.

Builder gives me a "shrug" and suggests replacing the screen in the flow switch. Sigh. Hence, my coming to some people who might be a bit more helpful. On a plus side, though. I called the Pentair line today in between our messages here, and got a hold of some guy who as able to look up the...

Here's a markup of your snippet. My responses to identify lines are in yellow. Let me know if this clears up the confusion.

Ozone insertion point is after the salt cell. You can see a close up in picture 3348. The insertion point your red dot is on before the salt cell is actually the Acid Insertion Point. And your other red dot is the return from the Intellichem back to the system (the low pressure side). The...

Here's everything, lol. You can zoom in and read the labels we printed to track what everything is and the directional flow. MDV AND Ozone are mounted on the wall. Insertion points are marked with printed labels on the pipes. I didn't take a picture of the Riverflow pump that we use to...

Do you still need pictures, or are the ones in the thread what you wanted? If you need others, let me know which parts of the system you want pictures of.

We opened it up and checked, and they appear to be.

I'm positive the CYA readings are correct. We do our own testing via our Taylor kit, and the 'black dot' never disappears from view. At first, we were skeptical, so we ordered a different bottle of Cyanuric Acid Reagent in case we had expired stuff in our kit, and we got the same results...

All you say is correct. However, usually the ORP values are somewhere in the hundred, not NEGATIVE digits, as changing as they always are. We understand how ORP works and its unreliability as to an accurate chlorine reading. The ORP stands for Oxidation Reduction Potential, not chlorine. :-)...

Auto Calibration appears to be occuring upon start up, and then gives the false values and goes into 'dosing mode' telling the IC40 to make chlorine. See pictures of screen on startup (after the standard flow delay) below. I do have flow going through the flow sensor (ours happens to be clear...