Do you also have a water heater switch in the inside of the coach? If so, you can leave the switch on the Truma unit on all the time. The only wiring connected to the Truma is a 12+ and ground and this is wired to an interior switch by all the other switches and panels and the interior switch is what turns the power on to feed the Truma. Before a trip I turn on the power switch behind the Truma panel and then everything else is controlled inside. This is the way we were shown at delivery and I also checked it with a volt meter at the Truma unit.
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