It's possible that you have the circuit board from the 75003 (Total Control). If you go into the INSTALLER MENU, and make sure the SELECT SYSTEM is programmed to PURIFIER.
Otherwise, check under the power supply and make sure there isn't a cable or jumper that is wired to a two position connector. There should only be the cell cord, tri-sensor cord, Green Bond wire, and a conduit with the incoming power wires.
ORP would mean that your cell is energized to 100%, which means you are potentially overdosing your pool with chlorine.
Please have the service center back out asap and test your chlorine to ensure your chlorine level isn't too high.