Dometic not cooling

Have a dometic rm 2862. Went to check on camper and everything was warm. Last was in it week ago. The lights were on. Have power. The check light wasn’t on. This has to be related but all I had with me was a test light. Not sure how this meters anyway. If was frosting over pretty bad and when I googled it came up check thermistor. Well it was laying behind some stuff so I defrosted for few days, clipped the thermistor on to the fin and seemed to work well until now. So question is did thermistor go bad and it’s not telling fridge to cool? I did briefly try propane. Stack got warm but fins didn’t cool.