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Doubtful they are all bad.........I never have much confidence in "techs" from Camping World as I have heard of too many horror stories! There may be an issue with the freeze sensors. If the fan speed is on low and the cooling is on high that can cause freeze ups. What is the make and model of these AC's? Get back to me with this and I can assist you further here. All follow ups are included in our fee.
Just checking back to see if you were able to resolve this or do you still need some additional input from me?