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If the only button that works on the console is the 'incline key of 6', then does the display show a change in the incline as ordered by that button?
And, does the incline change in the usual fashion, completely controllably from each end of its range to the other end of its range?
So 'raise incline' works properly, and shows the change, and 'lower incline' works, and the display shows the change.
But only the power button works otherwise.
I presume that the running belt does not work.
That sound like either a failure in the power supply, or a failure in control circuitry, possibly the motor controller board for the incline motor, or perhaps also a failure of the incline sensor but that's most likely secondary.
Let me know about the running belt, it controls, please.
Does the TV actually not come On?
The fan never works, I understand.
So does the TV show anything? or just 'static'/fuzz?
The lack of control button function in so many ways, plus the running belt not working, is unusual and hard to be sure of.
I would have to ask:
1. is this treadmill plugged into a surge protector or other power filtering device?
2. was there an electrical storm, thunderstorm, or similar weather even nearby, before it ceased to function properly?