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Error code reference

Daewoo Air Conditioner Error Code LED 1 time blink

Gas leak detected; unit continuously working.

Daewoo codesDaewoo air conditioner codes

Gas leak detected; unit continuously working.

First step from the service manual

Check the 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 LED 1 time blink means on a Daewoo air conditioner

The LED 1 time blink error on a Daewoo air conditioner signals that the system has detected a refrigerant gas leak. The unit continues to operate in this state rather than shutting down completely, but performance will be degraded because insufficient refrigerant reduces the system's ability to transfer heat effectively. The onboard diagnostics flag this condition through a single repeating LED blink pattern, alerting the technician or user that refrigerant levels or circuit integrity need immediate attention.

Refrigerant leaks in split and window air conditioning systems most commonly originate at brazed or flared pipe joints, Schrader valve cores, or along the interconnecting copper line set. A leak can also develop at the indoor or outdoor coil if corrosion or vibration damage has compromised the tubing wall. Because the unit continues running while leaking, compressor stress increases as suction pressure drops, which can lead to secondary damage if the condition is left unaddressed for an extended period.

The first diagnostic step is a thorough inspection of all refrigerant piping for signs of oil staining, which typically accompanies a refrigerant leak point. Electronic leak detection equipment or UV dye inspection should be used to pinpoint the exact location. Once the leak source is identified and repaired, the system must be pressure tested, evacuated, and recharged to the correct refrigerant specification before normal operation can resume. Refrigerant handling requires EPA 608 certification in the United States.

Source: manufacturer service documentation.

Common causes of LED 1 time blink

  1. 01

    Leaking flare or brazed joint on refrigerant line set

    Wiring / connection

    Flare connections at the indoor or outdoor unit service valves can loosen over time due to vibration or improper initial installation, allowing refrigerant to escape. Look for oily residue around the fittings as a primary indicator.

  2. 02

    Damaged or corroded evaporator or condenser coil

    Part replacement

    Formicary corrosion or physical damage to the copper tubing in either coil can create small pinholes that allow refrigerant to leak slowly. UV dye or an electronic leak detector is needed to confirm this location.

  3. 03

    Faulty or loose Schrader valve core

    Part replacement

    The service port Schrader valves on the outdoor unit can leak if the valve core is loose, worn, or was left unseated after a previous service. A simple valve core tool and replacement core can resolve this issue.

  4. 04

    Cracked or kinked copper line set

    Part replacement

    Line set tubing that has been bent too sharply during installation or has experienced physical impact can crack and allow refrigerant to escape. Inspect the full length of the line set for visible deformation or oil streaking.

  5. 05

    Loose or deteriorated service valve packing

    Wiring / connection

    The outdoor unit's ball valves contain packing nuts that seal the valve stem. If these loosen or the packing material deteriorates, refrigerant can seep out around the stem. Tightening or replacing the packing may resolve the leak.

See the test procedure for each cause

Frequently asked questions about LED 1 time blink

What does LED 1 time blink mean on a Daewoo air_conditioner?
The LED 1 time blink error code on a Daewoo air conditioner indicates that a refrigerant gas leak has been detected by the system. The unit continues to run rather than shutting off, but cooling capacity will be reduced. A technician should inspect all refrigerant piping, joints, and coils to locate and repair the leak source before recharging the system.
Can I fix a Daewoo LED 1 blink gas leak error myself?
Locating the leak by visually inspecting lines for oil staining is something a knowledgeable DIYer can attempt, but repairing the leak and recharging the refrigerant requires EPA 608 certification and specialized equipment. Attempting to add refrigerant without finding and repairing the leak first will only delay the problem. A licensed HVAC technician should handle the repair and recharge.
Is it safe to keep running my Daewoo air conditioner when the LED blinks once?
Continuing to run the unit while a refrigerant leak is present is not recommended for extended periods. Low refrigerant levels cause the compressor to operate under increased stress, which can lead to compressor overheating or premature failure. It is best to limit use and schedule a service call promptly to avoid more costly secondary damage.
How much does it cost to repair a refrigerant leak on a Daewoo air conditioner?
Repair costs vary depending on the leak location and the amount of refrigerant needed. A minor joint repair combined with a refrigerant recharge typically ranges from $150 to $450. If a coil or line set needs replacement, costs can rise to $400 to $1,200 or more depending on parts availability and labor rates in your area.
Will resetting my Daewoo air conditioner clear the LED 1 blink error?
Resetting the unit may temporarily clear the error display, but the underlying refrigerant leak will remain. The error will return once the system re-evaluates its operating conditions. A reset is not a repair, and the leak must be physically found, fixed, and the system properly recharged before the error will clear permanently.

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