1999 Lexus RX300 Q&A

1999 Lexus RX300 Question: A/C Control Problem

My A/C is working, in the sense that it is blowing cold air. Yesterday while the car was running, it just randomly auto-changed (best way to describe it) and no longer responds to my changing of the knobs/desired output of A/C. After some simple googling it seems it 'could' be the resistor? Or is it a problem with the digital display? Thank you. -
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