Do you have a heat pump on your RV? if you do, the outdoor sensor (the temp sensor in the rooftop unit) has lost communication with the thermostat. If you only have an air conditioner (not a heat pump) you can reset the thermostat by disconnecting shore power, disconnecting the battery and waiting for 4 or 5 minutes, then reconnecting power. The error code should reset and disappear. If, however, you do have a heat pump, you need to troubleshoot why your rooftop temp sensor is not communicating with your thermostat.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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