Press and hold the MORE button for 3 seconds and the IC will enter diagnostic mode (release the MORE button). After scrolling the LEDs, the lights for the % output will show the run time in 1,000's of hours. After that, the LEDs will show the internal thermistor reading of the temperature -
Lights…………….....………Temperature
No LEDs………….…..………Below 30F
40%..........................36 to 45F
40% and 60%............46 to 55F
60%..........................56 to 65F
60% and 80%............66 to 75F
80%.........................76 to 85F
80 and 100%............86 to 95F
100%.......................96 to 99F
100% blinking……..….over 99F
All LEDs blinking……...Sensor bad
If the temperature sensor is reading a temperature much high or lower than the actual pool water temperature, then you could have a bad flow switch (the flow switch has the thermistor built into it). You might have to replace the flow switch. Report back with what you see when in diagnostic mode.