Conditioner e7 error code amcoraire - Turboair TAS-24H Split System Air Conditioner

E7 i= "External Feedback Problem" which is a communication problem. There is a cable from the outdoor unit to the indoor unit ,check that cable is secured to the unit,check connections for tightness.
Here is the manual including instructions.
http://www.acwholesalers.com/EasyEditor/assets/amcor%20duo%20uchw-h12%20owners%20manual.pdf

what is your brand air conditioner?

I'm not sure if NewAir is made by Gree -- they supply many. On Gree units, E7 simply means one unit is requesting heating while another is requesting cooling and you can't have both at the same time. So that's the first thing to check. Very simple, very common, doesn't indicate that anything is wrong with the system.

E-7. This is a communication error between the indoorand out door units.

what does code 14 mean on Amcoraire H24AF2 unit

The E - 4 error code means the system is low on refrigerant type: R410A

The E-7 error code means the 2 wire defrost cable between the outdoor & indoor unit is disconnected or broken

E7 indicates an "External Feedback Problem" which sounds like a communication problem. I believe there is a sensor cable that runs from the outdoor unit to the indoor unit also. Check that all cables are properly run to the appropriate unit and check all connections for tightness. Here is the link to a manual that includes installation and wiring instructions.
http://www.acwholesalers.com/EasyEditor/assets/amcor%20duo%20uchw-h12%20owners%20manual.pdf

P 4 code means problem with the outdoor unit, Most likely low on refrigerant. Check all copper pipe connections for leaks first, then add refrigerant after checking pressures.

Because the model numbers are based on the country in which you bought the unit, you will have to do the research yourself on the error code for your unit. Once you find out what the error code is you can determine if low refrigerant caused the problem. Here is the contact info website to download your manual.
http://www.amcoraire.com/index.html