Arrived to find outdoor unit not coming on but air handler running. Found the drain pan full of water and secondary float Switch tripped. Drain line was backed up upon clearing drain line and getting unit up and running performed a full diagnostic on the system. System needs a primary float switch and an Iflo device to prevent future drain backups. Found unit with high liquid pressure. The unit being overcharged for this long has likely caused damage to the compressor. Unit is out of warranty and was never registered. Highly recommend replacing the system before investing, any more money into it.