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I am not as familiar with the Caldera products as I am with other Watkins tubs - and they do program the control box just a bit differently. But on other Watkins tubs with the IQ-2020 box you can move a jumper to get back the "upper temps." The very newest ones (2010 and forward) ship that way - but you have to press and hold the + button to get past 104, and the display turns a dangerous-looking blood red as it climbs. The older units you have to move the jumper.