Daewoo Air Conditioner Error Code ON LAMP 2 blinks (0.5s interval)

This blink pattern indicates a compressor or compressor electrical component fault, or a refrigerant gas leak in the system. The ON lamp flashing twice at 0.5-second intervals is the unit's way of alerting you to a condition in the outdoor unit or refrigerant circuit. Importantly, the unit continues to operate while this code is active, so the warning may be easy to overlook. A technician should inspect the terminal block voltage, connecting wires, relay RL1 on the power PCB, and the refrigerant lines as the first steps.

The unit is designed to continue operating when this code is active, but running the system with a potential refrigerant leak or compressor electrical fault can cause additional damage over time. A low refrigerant level puts extra stress on the compressor, which can lead to premature compressor failure. It is best to have the unit inspected promptly rather than continuing to run it indefinitely with the fault present.

Repair costs depend heavily on the root cause identified during diagnosis. Replacing relay RL1 on the power PCB is typically among the less expensive repairs, while repairing a refrigerant leak and recharging the system involves both parts and refrigerant costs that can push the total higher. Compressor electrical component failures or full compressor replacement represent the higher end of the cost range. Expect diagnostic fees plus parts and labor costs that can range from modest to several hundred dollars depending on what is found.

Some parts of the diagnosis, such as visually inspecting the connecting wires between the indoor and outdoor units for obvious damage, can be done without special tools. However, measuring terminal block voltage, testing relay RL1, and checking for refrigerant leaks require electrical knowledge and, in the case of refrigerant work, certification to handle refrigerants legally. It is strongly recommended to have a qualified technician handle the electrical and refrigerant components of this diagnosis.

A power reset may temporarily clear the displayed fault, but it will not resolve the underlying cause. If the compressor circuit issue, wiring fault, relay problem, or refrigerant leak is still present, the code will return once the system resumes normal operation. Resetting without diagnosis is not a fix and could delay identifying a worsening condition.