Turn off the hot tub and disconnect the power from the power cord or at the circuit breaker.
Open the hot tub access panel and locate the thermostat, which looks like a control knob connected to a copper wire.
Rotate the adjustment screw on the bottom of the thermostat with an Allen wrench. Turn clockwise to increase the thermostat temperature or counterclockwise to decrease the thermostat temperature.
Meredith Jameson writes early childhood parenting and family health articles for various online publications. She holds a Bachelor of Arts in history from San Francisco State University.
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