I have a 1999 Nordic Warrior with a Gecko Spapack 1.
As per the subject line, the heater stays on after the pump stops. I can hear the water boiling for a few seconds and then it shuts off and throws a HL code.
It seems to work properly. That is, if I raise the called for temp, it will run until the temp is reached with all the appropriate lights on the control panel showing and shut off when the temp is reached. If I manually run the jets it does the same thing. As soon as I manually turn off the jets, the heater boils and HL code.