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Error code reference

Daewoo Air Conditioner Error Code 2 blinks (0.5s interval, 8s cycle)

Outdoor coil sensor open or short, compressor or electrical parts of compressor error, or gas leak; unit…

Daewoo codesDaewoo air conditioner codes

Outdoor coil sensor open or short, compressor or electrical parts of compressor error, or gas leak; unit continues working.

First step from the service manual

1) Check voltage between L and Y of terminal block (indoor and outdoor unit). 2) Check connecting wire of indoor and outdoor unit. 3) Check relay RL1 on power PCB. 4) Check gas leakage of the pipe.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What 2 blinks (0.5s interval, 8s cycle) means on a Daewoo air conditioner

The 2-blink fault code on a Daewoo air conditioner (blinking at 0.5-second intervals within an 8-second cycle) signals one of three related fault conditions: an open or short circuit in the outdoor coil temperature sensor, a compressor or compressor electrical component fault, or a refrigerant gas leak. The outdoor coil sensor monitors heat exchange temperatures during operation, and if its resistance readings fall outside the expected range due to a wiring break or sensor failure, the control board flags this code. Importantly, the unit continues operating despite the active fault, meaning cooling or heating may still occur but at reduced efficiency or reliability.

The diagnostic path begins at the terminal block, specifically by checking the voltage between the L and Y terminals on both the indoor and outdoor units. This confirms whether the communication and power signals between units are within specification. From there, the connecting wiring between the indoor and outdoor units should be inspected for damage, loose connections, or corrosion. Relay RL1 on the power PCB controls key switching functions for the outdoor unit's electrical components, and a failed or welded relay contact can produce this fault. Finally, a refrigerant leak check of the refrigerant lines is required, as low gas pressure stresses the compressor and can trigger this error through abnormal operating conditions.

Source: manufacturer service documentation.

Common causes of 2 blinks (0.5s interval, 8s cycle)

  1. 01

    Outdoor coil sensor open or short circuit

    Part replacement

    The outdoor coil temperature sensor may have a broken wire (open circuit) or a wiring short, causing the control board to read an out-of-range signal. Inspect the sensor wiring and connector for visible damage or corrosion.

  2. 02

    Refrigerant gas leak

    Part replacement

    A leak in the refrigerant lines causes low gas pressure, which stresses the compressor and triggers this fault code. Check all pipe joints and connections for signs of refrigerant loss, such as oily residue.

  3. 03

    Relay RL1 failure on power PCB

    Part replacement

    Relay RL1 on the power circuit board controls switching for outdoor unit electrical components. A failed, stuck, or welded relay contact can interrupt correct operation and produce this fault.

  4. 04

    Loose or damaged connecting wiring between indoor and outdoor units

    Wiring / connection

    Damaged, corroded, or improperly seated wiring between the indoor and outdoor units can disrupt signal and power flow. Inspect all terminal block connections and inter-unit wiring for continuity and secure seating.

  5. 05

    Compressor or compressor electrical component fault

    Part replacement

    The compressor itself, or its associated electrical components such as capacitors or contactors, may be failing. This can occur alongside low refrigerant or relay issues and requires voltage and continuity testing to isolate.

See the test procedure for each cause

Frequently asked questions about 2 blinks (0.5s interval, 8s cycle)

What does 2 blinks (0.5s interval, 8s cycle) mean on a Daewoo air_conditioner?
This blink pattern indicates one of three fault conditions: an open or short circuit in the outdoor coil temperature sensor, a fault in the compressor or its electrical components, or a refrigerant gas leak. The unit will continue to operate while the fault is active, but the underlying issue should be diagnosed and corrected promptly. A technician should check terminal block voltage, inter-unit wiring, relay RL1 on the power PCB, and refrigerant charge.
Can I fix the 2-blink fault code on my Daewoo air conditioner myself?
Some parts of the diagnosis, such as inspecting connecting wires and terminal block connections for visible damage, can be done by a knowledgeable DIYer. However, checking relay RL1 on the power PCB, testing refrigerant pressure, and repairing a gas leak all require proper tools and, in the case of refrigerant work, a certified technician. Attempting refrigerant-related repairs without certification is illegal in most regions and potentially dangerous.
Is it safe to keep running my Daewoo air conditioner while the 2-blink fault is active?
The unit is designed to continue operating with this fault present, but running it with a refrigerant leak or a failing compressor can cause additional damage over time. If you suspect a gas leak or hear unusual compressor noise, it is safer to shut the unit down and have it inspected before further use.
Will resetting the unit clear the 2-blink fault code on a Daewoo air conditioner?
A power reset may temporarily clear the displayed fault, but it will not resolve the underlying problem. If the sensor fault, wiring issue, compressor problem, or refrigerant leak is still present, the 2-blink code will return after the unit restarts and runs through its cycle. The root cause must be identified and corrected to permanently clear the fault.
How much does it cost to repair a Daewoo air conditioner showing the 2-blink fault code?
Repair costs vary significantly depending on the root cause. Replacing a faulty outdoor coil sensor or a failed relay on the power PCB typically falls in the lower cost range, while compressor replacement or refrigerant leak repair and recharge tends to be considerably more expensive. A service call for diagnosis alone can range from $75 to $150 or more before any parts or refrigerant costs are factored in.

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