dometic refrigator

What is you outside and/ro room temp?? Dometic refers will not cool after starting if the room temp is cooler than about 30 degrees. Solution, turn on heat in coach, raise room temp to about 40 degrees or more with refrig door OPEN. Then refrig will cool. (usually) Thermostat is inside refrig, it is is too cool, refrig brain doesn't think it needs to run, so it doesn't