We don't understand it either. My friends that have the boat, are visiting, and their boat is on the West Coast
To me it sounds like the thermostat is bad, But he put in a new one.
With the thermostat hooked up, it will start up and run a while. Then it will cycle off. But when it tries to start it tries 3 times and goes into a wait mode.
By bypassing the thermostat, and connecting the wires, it starts. When tou disconnect the wires it stops, and will restart, when reconnected.
I think the new thermostat is bad.