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we need to do a few tests.
Press the up button on the right side, tell me if temp setting goes up or not AND if it lights the display or not.
Then do the same with the down button and tell me if lights the display or not.
If not, turn the System cool/off/heat switch to OFF, then back to heat and tell me if lights the display or not.
Repeat these tests a few times until you get consistent results and know the pattern.
Tell me what you find, we can go from there.