Amcoraire minisplit A/C
Model #AOS121HX
Not cooling/heating
P4 and p8 error codes


After having the A/C head unit previously installed. I had to remodel and relocate the head unit to another location in the room. Not being an A/C Tech myself, i needed to move it out of the way for the remodel crew and could not wait for an A/C tech to do it due to scheduling conflicts. So I unscrewed both the 1/4 " and 3/8" (gas and liquid) lines from the compressor. It vented all the gas. I dont remeber how soon after, but i did tape the open ends of the copper lines to prevent dust and moisture. (my back yard is not landscaped and has alot of loose soil that could find its way inside the lines). I then disconntected the lines from the head unit and removed the head unit from the wall to relocate a a later time. i taped that end of the lines and left them in the attic until the remodel was complete.

A few weeks later I reassemble the lines to the unit in the new location. To save some cash, I recruit my brother who went to a/c tech school and has some knowledge and tools to vacuum and recharge my system. (He is by no means a licensed tech, nor has ever worked on a mini-split system before) He ran a vacuum for at least 1 hour before adding the proper amount of refrigerant. This unit calls for just over 3 pounds of refrigerant. The only thing that he did not know is if it called for to be put in as a gas, or as a liquid. So, when recharging the a/c in a gas state was taking to long,(impatient guy) he turns the tank upside down and completes the charge in liquid form to within 1 oz under the spec called for. The unit worked, but It never was super cold like it was when it originally installed. I used it through the winter as a heat pump for a few months but it never heated the room properly. I then started getting a P8 code and a P4 code after restarting the unit.

I get my brother back to trouble shoot it. It turns out that all the refrigerant has slowly leaked out over a 3 month period. It has no charge at all. We determined that the 3/8" gas line may have been damaged when I relocated the unit. So I cut the white insulation from the entire length of both the copper lines. I found many DEEP KINKS throughout the 3/8" line which could previously could not be detected with the insulation wrapped around them. I then went to my local Lowes and bought a 20Ft coil of copper tubing. (they only come in 20ft and then jump to 50 ft.) So I cut 5ft of copper from a non kinked length of the original line and soldered them together with a coupling to get the required 25ft. I ran the new line and flared the ends and reattached the new non-kinked line and left the 1/4" line alone, as I did not see any kinks on it. My Brother then recharged the unit in the same manner as before. ( both gas and liquid).

IT ran great for about a week. When I went into the attic to wrap the line with insulation when I noticed that the 1/4" line was covered with frost. It looked like it was frozen over. My brother could not explain it. After a few more days as running the A/C I notice that that the air coming out was not as could as before. Then, the head unit gave me a P4 code.
That brings me up to the present. I know that this post is quite long, but I wanted to give the complete history of this unit so that I can get the most accurate answer to fix my unit. Thank you in advance for any answers that can help me out.
Louie

Optional Information:
Make : AMCORAIRE
Model : AOS121HX

Already Tried:
Amcoraire minisplit A/C Model #AOS121HX Not cooling/heating P4 and p8 error codes After having the A/C head unit previously installed. I had to remodel and relocate the head unit to another location in the room. Not being an A/C Tech myself, i needed to move it out of the way for the remodel crew and could not wait for an A/C tech to do it due to scheduling conflicts. So I unscrewed both the 1/4 " and 3/8" (gas and liquid) lines from the compressor. It vented all the gas. I dont remeber how soon after, but i did tape the open ends of the copper lines to prevent dust and moisture. (my back yard is not landscaped and has alot of loose soil that could find its way inside the lines). I then disconntected the lines from the head unit and removed the head unit from the wall to relocate a a later time. i taped that end of the lines and left them in the attic until the remodel was complete. A few weeks later I reassemble the lines to the unit in the new location. To save some cash, I recruit my brother who went to a/c tech school and has some knowledge and tools to vacuum and recharge my system. (He is by no means a licensed tech, nor has ever worked on a mini-split system before) He ran a vacuum for at least 1 hour before adding the proper amount of refrigerant. This unit calls for just over 3 pounds of refrigerant. The only thing that he did not know is if it called for to be put in as a gas, or as a liquid. So, when recharging the a/c in a gas state was taking to long,(impatient guy) he turns the tank upside down and completes the charge in liquid form to within 1 oz under the spec called for. The unit worked, but It never was super cold like it was when it originally installed. I used it through the winter as a heat pump for a few months but it never heated the room properly. I then started getting a P8 code and a P4 code after restarting the unit. I get my brother back to trouble shoot it. It turns out that all the refrigerant has slowly leaked out over a 3 mo