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Is this a Dometic Comfort Control II thermostat? If so, this is a communication fault. Try unplugging the cable from the thermostat and check it for moisture and then if dry, plug it back in again and try to reset it. If you don't have that instructions please let me know. All follow ups are included in our fee.
Do it on the A/C side as well.
Do the cables on those as well.
You may have to call in a mobile tech for some assistance then. He can run some tests for you and see if it is the control box or cable that is the problem.