Home / Air Conditioners Air Conditioner error codes Air conditioner codes cover window, portable and mini-split units. Most point to a temperature sensor, a full water tank or blocked drain, a fan fault, or lost communication between the indoor and outdoor units.
Code What it means Fix CH05 Indoor and outdoor units not communicating (mini-split) Easy DIY CH38 Low refrigerant protection (mini-split) Technician job CH61 Unit overheating (mini-split) Easy DIY CH10 Fan motor fault (mini-split and window) Moderate DIY CH01 Indoor temperature sensor fault (mini-split) Technician job CH21 Outdoor compressor or inverter fault (mini-split) Technician job FL also P2 Water tank full (portable) Easy DIY E1 Indoor pipe sensor fault (window and portable) Technician job E3 No refrigerant detected (window and portable) Technician job
Code What it means Fix E1 Temperature sensor fault (split and portable) Technician job E2 Temperature sensor fault (split and portable) Technician job E5 Indoor coil anti-freeze protection (split) Easy DIY E7 Indoor/outdoor communication fault (split) Moderate DIY E9 Overload in heating mode (split) Easy DIY E14 Indoor fan motor fault (split) Technician job F1 IPM inverter module protection (split) Technician job F13 Low refrigerant (split) Technician job F19 Supply voltage too high or low (split) Moderate DIY FL Water tank full (portable) Easy DIY