The chosen button flashes for a few seconds, then the whole screen goes black as though it were thinking...

It's black for a good minute before another screen appears that reads:

"To reset hot water production systems, press when ready."

Then a single button appears, waiting to be pressed. It seems the terminal won't tell her if she chose right or wrong. But once the button is ready to be pressed, do so.

[ooc: To make things easier, we can assume Kanaya has waited for the other hot water terminal to be found before she presses it.]