Unfortunately, your rear unit is calling for heat. If you put the rear unit on heat pump mode, does it then cool?
The reversing valve is energized in the cool mode of these AC's. So there is no real way to bypass it. I would check the thermostat and the control board in the unit to make sure that the switches are set correctly.
In the service manual section of the dometic/Rooftop RV Air Conditioner section. I have posted service manuals for the Heat Pump and the Comfort Control.
Hope this helps,
Jeff
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