Why does my Pentair HAFFMANS ICC Calculator display “LLL” or “HHH”?
- SShannon BallardAug 4, 2025
The Pentair Calculator displays “LLL” or “HHH” when the calculated CO2 value is out of range, typically due to out-of-range pressure or temperature values measured. Please refer to table 1, Appendix II for further assistance.

