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Yes it will be in defrost If you are concerned about it go ahead and switch the thermostat to emergency heat and let it run on the inside part only tonight that way you can get a good night sleep tonight and the outside wont try and run.
here is a link to a manual it is the infinity control for Carrier but is the same control never the less. it will walk you through the setting of the emergency heat it will be best to switch it to it until the tech can come out. If you push the red button it should stage through to the emergency heat setting.