Looped air conditioner condensate line not draining?
All of the Mini split systems I have Installed specify no loop of any kind even after a 8’ drop to the ground there needs to be a consistent down slope. On split with an air handler a loop is still the wrong thing a “p” trap or “u” bend are the proper method to allow water out and no sewer gasses in a loop traps air and will not drain. Since you said draining on the wall if the drain exits the house and drains on the ground no loop is needed. If it drains into a sewer drain then a trap is needed but this may be problematic see the manufacturers install instructions for proper setup.