What is the spa operating minimum and maximum water temperature?

The spa operates within water temperatures from 39ºF (4ºC) to 104ºF (42ºC). The water in the spa should never exceed 104ºF (42ºC). The overheating alarm will be activated displaying code “SPH/E0” if the temperature of the water exiting the heater unit is higher than 131ºF (55ºC), and the spa control unit will stop working. If this happens, unplug and plug back in the GFCI/RCD and test the GFCI/RCD to restart the system. When the water has cooled down to 104ºF (42ºC), reset the control panel information by pressing the RESET button located on the spa control base lower side. See owner’s manual for details.