Brand guide
Pentair Error Codes: Meanings & Safe Checks
Match the equipment family and displayed code before following any check.
Pentair pool heater 126 means Shorted water temperature sensor. See the verified model scope, safe checks, and official source.
Pentair pool heater E01 means Open water temperature sensor. See the verified model scope, safe checks, and official source.
Pentair pool heater E05 means Open stack flue sensor. See the verified model scope, safe checks, and official source.
Pentair pool heater E06 means Shorted stack flue sensor. See the verified model scope, safe checks, and official source.
Pentair pool heater ERR AFS means Air flow switch open: the blower is not on, or air through it is being restricted.
Pentair pool heater ERR AGS means Automatic gas shutoff: water temperature after the second pass through the heat exchanger is more than 140 degrees F.
Pentair pool heater ERR HLS means Hi temperature limit switch open: water temperature after the first pass through the heater exchanger is more than 135…
Pentair pool heater ERR IGN means Ignition Control Module was not able to ignite the heater.
Pentair pool heater ERR PS means Water pressure switch open: no water flow through the heater.
Pentair pool heater ERR SFS means Excessive stack flue temperature: the temperature of the stack flue is more than 480 degrees F.