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Hi my name is Robert....
Sounds like you have separate thermostats for the AC unit, the E-1 code is a communication fault between the thermostat and circuit board inside the AC unit, so this could be the thermostat, cable or circuit board. Normally what you can do is disconnect the batteries and unplug from shorepower for 20 mins and then hit the zone and mode buttons at the same time to reset the system, if that does not work then one of the components is at fault, I would check the cable where it plugs into the thermostat and at the board on the AC unit, beyond that I might try a new thermostat or find a shop that has a test thermostat to help narrow down the problem. Hope this helps some. IF you have more questions or concerns please feel free to contact me, follow ups are included.... Robert
One thing you might want to try as well is to swap the thermostats and see if the problem changes, if so you know the thermostat is at fault, if the problem remains it has to be an issue with the cable, or circuit board inside the AC unit... Hope this helps.
IF you are satisfied with my efforts please feel free to select a rating at the top of the page, it is the only way I get credit for helping.... Robert
HI.... Was just checking in to see if my answer helped??? IF you have more questions or concerns please feel free to contact me....