Your pump should have an alarm, but if the prop hasn't locked up or the pump hasn't run dry it wouldn't go off.
We actually got some unexpectedly last month. They found 15 of them in the factory while doing inventory. These are actually the 6200.800 which was the 6200 transformer, it functions the same as the 7410.602 which was the 6100 transformer, it just can handle a higher wattage draw, they are both 19V. They are $50 each and are brand new.