1117 3.3v heats

[papele]

 Hi.i have a 3.3volt l1117 regulator mounted on main 20-ALEU002-30-0X which heats up. the voltage is 2.3 volts instead of 3.3volt. the vref is 2v. can it be faulty?

[CAIIIA]

Use additional supply power +3,3V for test

[papele]

Do I have to unplug the output pin?

[CAIIIA]

yes