Daewoo Air Conditioner Error Code 3

Error code 3 on a Daewoo air conditioner indicates a fault related to the compressor, the electrical components of the compressor circuit, or a refrigerant gas leak. The system signals this code through the red ON lamp flashing in a 0.5-second on/off pattern for 8 seconds. This code points to the outdoor unit's refrigeration and power delivery systems as the areas requiring inspection.

A refrigerant leak, which is one potential cause of this error, can pose health risks in enclosed spaces and should be addressed promptly by a qualified technician. Electrical faults in the compressor circuit also carry a risk of damage to other components if the unit continues to operate. It is best to turn off the air conditioner and arrange for a professional inspection when this code appears.

Resetting the unit may temporarily clear the fault display, but the code will return if the underlying problem has not been corrected. Because this error involves compressor circuitry or a potential refrigerant leak, a reset alone is not a fix. The root cause must be diagnosed and repaired to prevent recurring faults and potential damage to the compressor.

Start by checking the voltage between terminals L and Y on the terminal block at both the indoor and outdoor units, and inspect the connecting wire between the two units for damage or loose connections. Test relay RL1 on the power PCB for proper operation, and verify that the indoor coil thermistor is firmly secured to the coil. If no electrical fault is found, inspect all refrigerant line connections and fittings for signs of a gas leak, as refrigerant recovery, repair, and recharge must be performed by a certified technician.

Repair costs vary widely depending on the root cause. A simple wiring fix or thermistor reseating may cost relatively little in labor, while relay replacement on the power PCB typically runs in the range of $75 to $200 including parts and labor. A refrigerant leak repair combined with recharge can range from $150 to $500 or more depending on the leak location and the amount of refrigerant required.