In our 2015 rig we had the MaxxFan control boards which were the v1 type and were prone to several failures. I have replaced both the bathroom and kitchen control boards with the new v2 boards. I now carry a spare just in case. They have worked as designed ever since. Google search will give you the part number to order. The rain sensor is just a switch.
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SOB
2015 Volvo VNL780 D13, iShift, 32k ET air hitch, Idle Free LiFePO4 APU
16.8KWhr LiFePO4, 2.52 kw solar, 10kva Victron split phase
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