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Error code reference

Daewoo Air Conditioner Error Code 2 blinks

Indoor coil sensor open or short, OR outdoor coil sensor open or short, OR compressor or electrical parts of…

Daewoo codesDaewoo air conditioner codes

Indoor coil sensor open or short, OR outdoor coil sensor open or short, OR compressor or electrical parts of compressor error - unit continues working with fixed room temperature of 18°C in cooling mode.

First step from the service manual

Check indoor coil sensor and outdoor coil sensor for open or short. Check compressor operation - if compressor ON for 5 minutes and indoor coil temperature change is below +/-2°C, compressor error is detected.

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

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What 2 blinks means on a Daewoo air conditioner

The 2-blink error code on a Daewoo air conditioner indicates one of three possible fault conditions: an open or short circuit in the indoor coil temperature sensor, an open or short circuit in the outdoor coil temperature sensor, or a compressor/compressor electrical component failure. When this code is active, the unit does not shut down entirely. Instead, it enters a limp mode and continues operating at a fixed cooling setpoint of 18°C, regardless of the room temperature setting selected by the user.

The compressor fault detection logic works as follows: if the compressor runs continuously for 5 minutes and the indoor coil temperature does not change by at least plus or minus 2°C, the control board interprets this as a compressor error. This indicates the system is either not producing refrigerant flow, not generating heat exchange at the indoor coil, or has lost compressor function due to an electrical fault in the compressor circuit. Sensor faults are distinguished by resistance readings outside the expected range for the thermistor, which would indicate either an open circuit (infinite resistance) or a short circuit (near-zero resistance).

Diagnosing this code requires isolating which of the three fault sources is responsible. Begin by testing the indoor and outdoor coil sensors for correct resistance values at a known ambient temperature. If both sensors check out, monitor indoor coil temperature during a 5-minute compressor run cycle to determine whether the coil is responding to compressor operation. A coil temperature that remains static during this test points to a compressor or compressor electrical component fault rather than a sensor issue.

Source: manufacturer service documentation.

Common causes of 2 blinks

  1. 01

    Indoor coil sensor open or short circuit

    Part replacement

    The indoor coil thermistor has failed, producing either infinite resistance (open) or near-zero resistance (short), causing the control board to flag a sensor fault. Inspect the sensor connector for corrosion or damage and measure the thermistor resistance to confirm.

  2. 02

    Outdoor coil sensor open or short circuit

    Part replacement

    The outdoor coil thermistor has experienced an open or short circuit similar to the indoor sensor fault. Check the sensor wiring harness for physical damage from weather exposure and verify resistance values at the connector.

  3. 03

    Compressor not producing adequate refrigerant flow

    Part replacement

    If the compressor runs for 5 minutes without the indoor coil temperature changing by at least 2°C, a compressor error is logged. This can result from low refrigerant charge, a seized compressor, or a failed start capacitor.

  4. 04

    Compressor electrical component failure

    Part replacement

    Wiring faults, a failed run capacitor, or a defective relay in the compressor circuit can prevent normal compressor operation and trigger this code. Inspect all compressor electrical connections and associated components for continuity and proper function.

  5. 05

    Loose or corroded sensor wiring connector

    Wiring / connection

    A poor connection at the sensor harness plug can simulate an open circuit without the thermistor itself being defective. Reseating or cleaning the connector may resolve the fault before any parts replacement is needed.

See the test procedure for each cause

Frequently asked questions about 2 blinks

What does 2 blinks mean on a Daewoo air_conditioner?
Two blinks on a Daewoo air conditioner signals a fault with the indoor coil sensor, the outdoor coil sensor, or the compressor and its electrical components. The unit continues to operate in a reduced mode, cooling at a fixed setpoint of 18°C rather than the user-selected temperature. The specific fault source must be diagnosed by testing the sensors and monitoring compressor performance.
Can I fix the 2-blink error on my Daewoo air conditioner myself?
Checking sensor wiring connectors for looseness or corrosion is within reach for a knowledgeable DIYer and requires no special tools. However, measuring thermistor resistance accurately requires a multimeter, and diagnosing compressor faults involves working with refrigerant and high-voltage components that require a licensed technician. If the coil sensors and their wiring appear intact, professional service is the appropriate next step.
Is it safe to keep running my Daewoo air conditioner while showing 2 blinks?
The unit is designed to continue operating in a failsafe mode at 18°C when this code is active, so it is not immediately dangerous to run it temporarily. However, continued operation without resolving a compressor fault can cause additional wear or damage to electrical components. It is best to have the unit diagnosed promptly rather than relying on failsafe mode for extended periods.
Will resetting the unit clear the 2-blink error code?
A power cycle may temporarily clear the displayed code, but if the underlying fault, whether a failed sensor or a compressor issue, still exists, the error will return once the unit attempts normal operation again. The 5-minute compressor runtime check means the fault could reappear within minutes of restarting. A reset is not a repair, and the root cause must be addressed to permanently clear the code.
How much does it cost to repair a Daewoo air conditioner showing 2 blinks?
Repair costs vary depending on the fault source. Replacing a coil temperature sensor is generally a lower-cost repair, typically ranging from around $50 to $150 including parts and labor. Compressor repairs or replacements are significantly more expensive, often ranging from $300 to $800 or more depending on the unit size and the extent of electrical damage. A diagnostic service call is the best way to get an accurate estimate for your specific situation.

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