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Error code reference

Daewoo Air Conditioner Error Code 1 blink (8s)

Indoor coil sensor open or short circuit; unit does not work.

Daewoo codesDaewoo air conditioner codes

Indoor coil sensor open or short circuit; unit does not work.

First step from the service manual

Check fixing of indoor coil thermistor.

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

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What 1 blink (8s) means on a Daewoo air conditioner

The 1 blink (8s) error code on a Daewoo air conditioner signals a fault in the indoor coil thermistor circuit. This thermistor is a temperature-sensing resistor mounted directly on the indoor evaporator coil. Its primary function is to report coil temperature to the control board so the unit can regulate cooling cycles, prevent freeze-up, and protect the system from running in unsafe thermal conditions. When the control board detects a resistance reading outside the expected range, it classifies the sensor as either open (infinite or very high resistance) or short-circuited (near-zero resistance), triggering this fault and shutting down normal operation completely.

An open circuit in the thermistor circuit typically points to a broken sensor element, a disconnected connector, or a damaged wire in the sensor harness. A short circuit usually indicates a pinched or abraded wire making contact with the chassis, or internal failure of the thermistor itself where the resistance has collapsed. Because thermistors are NTC (negative temperature coefficient) devices, their resistance decreases as temperature rises. Any reading that falls outside the expected resistance curve for the operating temperature range will trigger the fault.

The first diagnostic step is to physically inspect the mounting and connection of the indoor coil thermistor. A sensor that has vibrated loose from its clip on the coil will read anomalous temperatures and can produce false open or short readings. After confirming the sensor is properly seated, the harness and connector should be inspected for damage, corrosion, or loose pins before testing thermistor resistance directly with a multimeter.

Source: manufacturer service documentation.

Common causes of 1 blink (8s)

  1. 01

    Thermistor dislodged from coil clip

    Wiring / connection

    Vibration during operation can cause the thermistor to slip out of its mounting clip on the evaporator coil, resulting in wildly inaccurate temperature readings that the control board flags as a fault. Inspect the sensor physically to confirm it is fully seated in its bracket.

  2. 02

    Failed indoor coil thermistor

    Part replacement

    The thermistor element itself can fail internally, producing either an open circuit or a short circuit condition. Testing the sensor with a multimeter will show resistance values outside the expected NTC curve for the ambient temperature.

  3. 03

    Damaged or corroded wiring harness

    Wiring / connection

    The wire leads connecting the thermistor to the control board can become pinched, abraded, or corroded, causing an open or short circuit in the signal path. Carefully trace the harness from the sensor to the connector on the board, checking for any visible damage or moisture intrusion.

  4. 04

    Loose or corroded connector at the control board

    Wiring / connection

    The thermistor connector on the control board can work loose over time or develop corrosion on the pins, interrupting the circuit. Unplugging and firmly reseating the connector, and cleaning any oxidation from the pins, can resolve this without replacing parts.

  5. 05

    Faulty indoor control board

    Part replacement

    If the thermistor and all wiring test within specification but the fault persists, the control board's sensor input circuit may have failed, causing it to misread a good sensor as open or shorted. Board replacement would be required in this case.

See the test procedure for each cause

Frequently asked questions about 1 blink (8s)

What does 1 blink (8s) mean on a Daewoo air_conditioner?
The 1 blink (8s) code indicates that the indoor coil thermistor has been detected as either open or short-circuited. This thermistor monitors the temperature of the evaporator coil and is essential for safe operation. Because the control board cannot trust the temperature data, the unit shuts down completely until the fault is resolved.
Can I fix the 1 blink (8s) error on my Daewoo air conditioner myself?
Some causes of this error are DIY-accessible, such as reseating a dislodged thermistor back into its coil clip or firmly reconnecting a loose wiring harness connector. If the thermistor itself has failed, the sensor can often be replaced at moderate cost without specialized tools. However, if the control board is at fault, professional diagnosis is recommended before investing in a board replacement.
Is it safe to keep running my Daewoo air conditioner when it shows this error?
The unit is designed to stop operating when this error is active, so continued running is not possible without repairing the fault first. Attempting to bypass the fault is not recommended, as the coil temperature sensor protects the system from freeze-up and other damage that can occur without accurate thermal feedback.
How much does it cost to repair the 1 blink (8s) error on a Daewoo air conditioner?
Repair costs vary depending on the root cause. If the thermistor only needs to be repositioned or a connector reseated, there may be no parts cost and only a service call fee, typically in the range of $75 to $150. Replacing the thermistor sensor itself usually adds $15 to $60 in parts. A control board replacement, if required, can range from $150 to $400 or more depending on the model.
Will resetting my Daewoo air conditioner clear the 1 blink (8s) error?
A power reset may temporarily clear the error code, but if the underlying thermistor fault is still present, the code will return as soon as the control board runs its diagnostic checks. Permanent resolution requires identifying and correcting the actual fault in the sensor, wiring, or connector before the reset will hold.

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