Air Conditioner Error Codes
3 error codes across 5 brands
Air conditioner error codes flag faults across the refrigerant circuit, indoor and outdoor fan motors, temperature and pipe sensors, and the communication link between the indoor and outdoor units. On mini-split and window units the code usually points to a sensor or communication fault rather than a compressor failure — check the sensor wiring and the indoor/outdoor data cable before assuming the worst.
This page tracks 3 air conditioner error codes across 5 brands , most commonly involving sensor (2), control (1). About 3 can usually be diagnosed and fixed at home, while 1 signal serious faults that warrant a professional. Typical repair costs range from $0 for simple DIY fixes to $450 for professional component replacement. Pick your brand below for the exact meaning, likely causes, and step-by-step fix for each code.