Neil, I wonder if you are operating your HW heater on propane or electric. If propane, one would assume you are not out of propane. If on electric you should first check the breaker to make sure it has not been tripped.
There is a switch also at the heater itself, and that must be on, however one would also assume it had not been turned off, unless accidentally. Open the cover to access this switch.
My pump will not pump from the fresh water tank when in the Normal Flow setting, it must be set to Fill. sounds like yours is acting normal to me....
Hope that helps.
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