Fault/error/failure in this example

Having following general definitions:
fault - a cause of the error (mistake in coding)
error - incorrect state that may lead to failure
failure - deviation of the service from the correct service

What would be the correct application on the following code:

The code should not allow withdrawal when there is a balance of 100 or less

  if (Balance<100) 
    {
    return false; 
    }
    else WithDraw();

So as I understand it, the fault is the missing = operator. But what will be the error and failure?