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

The ON LAMP blinking twice at 0.5-second intervals on a Daewoo air conditioner signals a compressor or compressor electrical component fault, or a refrigerant gas leak. Despite the fault detection, the unit continues operating, which means the system has not fully shut down but is alerting technicians that a condition exists that requires investigation. This code points specifically to the outdoor unit's compressor circuit and the refrigerant circuit as the primary areas of concern.

The diagnostic process begins at the terminal block, where voltage between terminals L and Y must be measured to confirm proper electrical supply and signal communication between the indoor and outdoor units. A wiring fault or break in the connecting wires between the two units can produce this error by disrupting the control signals that monitor compressor operation. Relay RL1 on the power PCB is a critical component in this circuit, responsible for controlling compressor energization. A failed, stuck, or intermittently faulty RL1 relay can cause incorrect compressor operation signals, triggering the blink code.

Refrigerant gas leakage is also a listed cause for this fault. A low refrigerant charge can cause abnormal compressor behavior, including elevated current draw, overheating, or erratic cycling, all of which can register as a compressor error. Inspecting the refrigerant lines, fittings, and coil connections for signs of oil residue or frost is part of the gas leak evaluation. A proper leak check using appropriate detection equipment is required before any refrigerant is added.