I have the IC40 also. Not sure how to tell what version I have. However, it can be calibrated and I have looked at the circut board and it has the 3 resistors compared to the 1 resistor model.
My issue is that the power light is a constant red. Also, when the unit starts, as it goes through its startup process and the salt level lights (Grn,Ylo,Red) cycle sometimes it cycles through all three as it did when new and now it only cycles through the grn and red.
The generator is producing chlorine however I have a red power light and the only info in the manual is to call for service.
Any help is greatly appreciated.
Thank you in advance,