Thermostats have my head spinning...

[tttaylorrr]

But isn’t the ez just a crank dial.

yes.

So if it’s set at 90 and power fails then it comes back it still sits at 90.

it will not turn back on after a power failure if i'm correct.

So the ez will shut down of too hot ?

it will turn off if something within itself fails, whether motherboard or fuse or something else.