They stick from not being turned. The knob should pull off. Use some penetrating oil around the stem and carefully try to turn back and forth with pliers.
Our Dominic upper deck fridge was working just fine before storage. Now it does not work at all. No lights power etc. Power plug in switch is working. The knob you refer to inside is stuck as well. Does that knob turn the fridge off and on by chance? If we unstick it maybe the fridge would work?? We really don't want to buy new fridge if this can be fixed .Thanks.
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2018 Cherokee 39RL Land Yacht (Sorry...)