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Calibrate temperature controller

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firedog11ku:
I have a tiger river Sumatran that I am told has the same controller as many hot springs hot tubs. It's the IQ2020 with the LCD screen. I recently had to replace the heater and heater relay board. Now the temperature on the controller shows 96 and the temperature using three different thermometers in the water is 104. Is there any way to calibrate the controller? Thanks for the help.

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