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    Pentair Mastertemp 400 already replaced SFS and still getting E05

    We are having the same problem many have posted about - start up heater, once the ignition kicks in, it blows hot for 10 -20 seconds, then turns off and displays E05. On the control board, the SFS light is lit along with LED11 (service heater). We replaced the SFS yesterday and still get this...