Panel lights up. Power is On. Hear it humming but it never "kicks on" and does not cool down. I have tried on DC and AC. In camper and in house. Ran it off battery and shore power in camper. Norcold/RV dealer said there arent parts available and they cant be repaired. Is that true? Is replacement only option? If repair is possible, where and what do you think the issue is? Thanks!