I found the problem.
I was checking the thermistor resistance and found that I had the connector offset by 1 pin.
In other words only 1 pin was contacting the motherboard.
I had disconnected it when I replaced the heater and re-connected it improperly.
The thermistor never registered a rise in water temp so the motherboard shut-down
the heater.
Will check back later to verity the water is actually getting hot.
Thanks,
Mark