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Try checking the dip switches on the new unit. They may not be set correctly. The thermostat only goes by what that A/C tells it to do and needs. Randall
It would help if I had the model number of this A/C and the style of the thermostat. If this is a digital model I need to know which one as they have more than one. It would probably be a 5 button Comfort Control or a newer Comfort Control II version.
I am adding a link to the Dometic A/C Service Manual for you that explains just about anything you need to know about this. If you use this and a small digital multimeter we can track down about any issue with this. http://bryantrv.com/docs2/docs/acservice.pdf
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