A common complaint on this model toilet is there is a screen at the inlet where the supply line attaches to the pedal/valve.
The screen gets clogged and no water flows when depressing the pedal.
Most have said it is very hard to see the screen unless you take a mirror and use to see back inside the valve once the line is off. Blowing out with compressed air (duster can or compressor) usually fixes the problem.
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