JBJ Chiller Showing Incorrect Temperature

Hi All-I have a JBJ 1/15 HP Chiller for my Nano Tank. I traditionally take it down in the Fall/Winter and set it up again in the Spring. Today I set it up and the temperature readout is showing only 67.4 degrees when the tank is actually around 75. I thought about a replacement controller, but then wondered if it could be the equivalent of a faulty thermostat? (If that's even a replacement part). Sorry, I really don't know much about this stuff. Any help is appreciated.

*To test it, I set the chiller down to 60 degrees and everything appeared to come on as it should.
 
Have you tried recalibrating the internal temperature sensor? Hold the up and down buttons at the same time for 10-15 seconds. “CA” (calibrate) will show up on the display. Then the temperature reading will blink... use the up or down keys to adjust the temperature accordingly.
 
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