I've put the batteries into both stations and still am only getting my room temp nothing else.Do I need to install the one outside before I'll get a reading of the outside temp?

That unit is only good for 30-350 sq feet, May be less depending on is the room has an east or west orientation., is the room well insulated, is the door closed on room being cooled> My inclination on is that the unit is too small, it cannot cool a room of door is left open, if the window's do not darkening curtains or shades, if the outside temp is very hot. If unit is new I would return it for another one. I have installed this type unit and I felt it left a lot be desired.. Give me your room dimensions and I can calculate and give you size of room.
https://www.totalhomesupply.com/air-conditioner-btu-calculator/

Let see if I can help. The numbers don't come up so we'll just try your information.

Exhaust - should be closed when using for Air Conditioning
Energy savings turns the fan off with the compressor when set for Air Conditioning
Fan Only means just that (no Air Conditioning)
Fan speeds Quite same as low, Norm same as medium, Super same as High
Temp settings, what the thermostat senses before cycling compressor.

I have the same problem. Any ideas? My guess is that the outside temp sensor is defective.

I had the same problem, Since the outside temp wouldn't read, I figured it was the outside unit batteries. Went through half a dozen AAA batteries and wouldn't read. It was the indoor unit. Had the same bats I installed 3 years ago. DUH! Replaced the AAA, and all was well. When the inside batteries die out, it has just enough juice to read indoor temp, but not enought to sense exterior signal.

Sometimes the RF frequency from the outside transmitter loses contact with the clock's frequency ( it has happened to me only twice in 6 years ), and then the outside temp will not show. Simple solution to fix this is: Take down the outside transmitter and the internally mounted clock. Remove batteries from both. Wait about 10 mts. First install batteries in the transmitter, then after about 30 seconds, install batteries in the clock. In about 5 mts, you will find the clock showing the external temp like before.

My outside display stopped working, but the inside display still worked. I found that one of the two batteries in the inside unit was almost all the way dead. Once I replaced both batteries the outside display worked. I also checked the batteries in the outside unit. After all batteries were installed, I pushed the small button that is inside the battery compartment on the outdoor unit. It's now working perfect..