Simple timer / if statement question

I have this code running a timer that ticks down with the deltaTime

var myTimer : float = 2.0;
function Update() {
  Debug.Log(myTimer);
  myTimer -= Time.deltaTime;
  if (myTimer <= 0) {
    Debug.Log ("myTimer < 0");
    myTimer = 2.0;
  }
}

So this prints to the console myTimer decrementing toward zero and beyond. When myTimer becomes less than zero for the first time then the if statement is true "myTimer < 0" fires as it should and myTimer is reset to 2.0. From here on out, however, when the if statement is true and the myTimer is reset to 2.0 the Debug.Log("myTimer < 0"); never fires. I am perplexed as to why the timer updates but the Debug.Log command never fires.

Any thoughts?

Cheers