The OP has a RV Comfort 2C thermostat.
Mgrandysr - I agree with you. Your remote sensor is too close to a significat source of heat. I suggest, if the wiring has enough slack in it, that you simply relocate the sensor away from the heat source. These sensors can fail so if you continue to have a problem, purchase a new sensor and relocate it further away from the heat source.
Roger & Mary
2017 Winnebago Navion 24V (Sold)
2014 Tiffin Phaeton 36GH (Sold)