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Error code reference

Daewoo Air Conditioner Error Code LED 3 times blink

Compressor or electrical parts of compressor error; unit continuously works to fix room temperature at 18°C…

Daewoo codesDaewoo air conditioner codes

Compressor or electrical parts of compressor error; unit continuously works to fix room temperature at 18°C in heating mode or 32°C in cooling mode.

First step from the service manual

At start operation, check if compressor is ON and after 5 minutes the indoor coil temperature change is below +/-2°C; detected in Emergency Mode Operation only.

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

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What LED 3 times blink means on a Daewoo air conditioner

The LED 3 times blink error on a Daewoo air conditioner signals a compressor error or an electrical fault within the compressor circuit. This error is exclusively detected during Emergency Mode Operation, meaning the unit has already encountered a condition severe enough to trigger a fallback state. In Emergency Mode, the system bypasses normal temperature control and locks room temperature regulation to a fixed setpoint: 18°C in heating mode or 32°C in cooling mode. This is a protective operating state that keeps the unit functional at a basic level while indicating an underlying hardware fault.

The primary diagnostic trigger for this code involves monitoring compressor startup and coil temperature response. At the moment operation begins, the system checks whether the compressor is running and then tracks indoor coil temperature over a 5-minute window. If the coil temperature change remains below plus or minus 2°C during that window, the system interprets this as evidence that the compressor is not effectively moving refrigerant, pointing to a compressor failure or an electrical fault preventing proper compressor operation. A functioning refrigeration circuit will produce a measurable temperature shift at the indoor coil within this timeframe.

Potential root causes span both mechanical and electrical domains. On the electrical side, faults can include failed compressor motor windings, capacitor failure, or a fault in the compressor drive or control board relay that prevents the compressor from starting or sustaining operation. On the mechanical side, a seized compressor, refrigerant loss, or a stuck reversing valve in heat pump systems can all result in insufficient heat exchange at the coil, triggering this diagnostic condition.

Source: manufacturer service documentation.

Common causes of LED 3 times blink

  1. 01

    Compressor electrical fault or failed motor windings

    Part replacement

    A fault in the compressor motor windings or internal electrical components can prevent the compressor from starting or running properly. This results in no refrigerant circulation and no measurable coil temperature change within the 5-minute detection window.

  2. 02

    Failed or weak run capacitor

    Part replacement

    A failing run capacitor can prevent the compressor from starting or cause it to run inefficiently. If the compressor cannot build sufficient pressure, the indoor coil will not show the expected temperature shift.

  3. 03

    Low refrigerant charge or refrigerant leak

    Part replacement

    A significant loss of refrigerant reduces the system's ability to transfer heat, which can cause the indoor coil temperature to remain flat during startup monitoring. Inspection for leaks at fittings, coils, and line connections is required.

  4. 04

    Compressor control board relay or wiring fault

    Wiring / connection

    A faulty relay on the control board or damaged wiring in the compressor circuit can interrupt the electrical supply to the compressor. Verify that the compressor is actually receiving power during the startup phase before assuming the compressor itself has failed.

  5. 05

    Seized or mechanically failed compressor

    Part replacement

    A compressor that is mechanically seized will draw high current or fail to turn at all, resulting in zero refrigerant movement and no coil temperature response. This typically requires full compressor replacement.

See the test procedure for each cause

Frequently asked questions about LED 3 times blink

What does LED 3 times blink mean on a Daewoo air_conditioner?
The LED 3 times blink code on a Daewoo air conditioner indicates a compressor error or an electrical fault in the compressor circuit. The unit detects this fault during Emergency Mode Operation by checking whether the indoor coil temperature changes by more than plus or minus 2°C within 5 minutes of startup. If the coil temperature stays flat, it confirms the compressor is not moving refrigerant effectively. While the fault is active, the unit locks to a fixed temperature setpoint rather than following your normal settings.
Can I fix the LED 3 times blink error on my Daewoo air conditioner myself?
Some electrical checks, such as inspecting wiring connections or testing a run capacitor, may be within reach of a knowledgeable DIYer with the right tools. However, diagnosing compressor motor windings, identifying refrigerant leaks, and handling refrigerant requires certified technician equipment and licensing. Because this fault points directly to the compressor or its electrical supply, professional diagnosis is strongly recommended.
Is it safe to keep running my Daewoo air conditioner when it shows the LED 3 times blink error?
The unit will continue operating in Emergency Mode, maintaining a fixed temperature setpoint, so it is not in an immediate shutdown state. However, running the system with an underlying compressor or electrical fault for an extended period can cause additional component damage. It is best to have the unit inspected promptly rather than relying on Emergency Mode as a long-term solution.
Will resetting my Daewoo air conditioner clear the LED 3 times blink error?
A power reset may temporarily clear the fault indication, but the error will return if the underlying compressor or electrical problem has not been resolved. Because this code is detected through a timed coil temperature check at startup, the system will re-enter Emergency Mode and resume blinking as soon as it confirms the compressor is not performing correctly.
How much does it cost to repair the LED 3 times blink error on a Daewoo air conditioner?
Repair costs vary widely depending on the root cause. Replacing a run capacitor is generally inexpensive, typically in the range of $50 to $150 including labor. Refrigerant recharge and leak repair can range from $150 to $400 or more. Compressor replacement is the most costly scenario, often ranging from $600 to $1,500 or higher depending on unit size and part availability. A diagnostic service call is the first step to getting an accurate estimate.

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