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Error code reference

Daewoo Air Conditioner Error Code 1 blink (8s cycle)

Room sensor open or short circuit; unit continues working with fixed room temperature of 32°C in cooling mode.

Daewoo codesDaewoo air conditioner codes

Room sensor open or short circuit; unit continues working with fixed room temperature of 32°C in cooling mode.

First step from the service manual

Check room air temperature thermistor for open or short condition.

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What 1 blink (8s cycle) means on a Daewoo air conditioner

The 1 blink (8s cycle) error on a Daewoo air conditioner indicates a fault with the room air temperature thermistor, also called the room sensor. This thermistor is a negative temperature coefficient (NTC) resistor mounted in the indoor unit that continuously feeds ambient room temperature data to the control board. When the control board detects that the sensor signal falls outside the expected resistance range, it classifies the fault as either an open circuit (infinite or excessively high resistance) or a short circuit (near-zero resistance). Either condition means the board can no longer read accurate room temperature, which would normally compromise the unit's ability to regulate cooling output.

Rather than shutting down completely, the Daewoo unit enters a failsafe mode and substitutes a fixed reference temperature of 32 degrees Celsius in place of the real sensor reading. The system continues to operate cooling mode using this assumed value, which means the unit will run but cannot properly modulate based on actual room conditions. Cooling performance will be inconsistent, and the compressor may run longer than necessary or fail to reach the thermostat setpoint you have set.

The most direct diagnostic approach is to disconnect the room thermistor and measure its resistance with a multimeter. A healthy NTC thermistor will show a predictable resistance at room temperature. An open circuit will read as infinite resistance (OL), while a short circuit will read at or near zero ohms. Inspect the wiring harness between the sensor and the control board for damage, pinched wires, or corroded terminals before concluding the thermistor itself has failed.

Source: manufacturer service documentation.

Common causes of 1 blink (8s cycle)

  1. 01

    Failed room temperature thermistor

    Part replacement

    The thermistor itself has developed an open or short circuit internally, producing a resistance reading outside the acceptable range. Confirm by measuring resistance across the thermistor leads with a multimeter.

  2. 02

    Damaged or broken wiring harness

    Wiring / connection

    The wire leads connecting the thermistor to the control board can be pinched, cut, or broken, causing an open circuit. Inspect the full length of the wiring from the sensor plug to the board connector for visible damage.

  3. 03

    Corroded or loose connector terminals

    Wiring / connection

    Moisture inside the indoor unit can corrode the thermistor connector pins, increasing resistance or interrupting the circuit entirely. Clean or reseat the connector and check for green or white oxidation on the terminals.

  4. 04

    Control board fault

    Part replacement

    If the thermistor and wiring both test correctly, the input circuit on the control board may have failed and is misreading the sensor signal. This requires substituting a known-good thermistor to rule out the sensor before condemning the board.

See the test procedure for each cause

Frequently asked questions about 1 blink (8s cycle)

What does 1 blink (8s cycle) mean on a Daewoo air_conditioner?
The 1 blink in an 8-second cycle is a fault code indicating the room air temperature thermistor has either an open circuit or a short circuit condition. The control board cannot obtain a valid temperature reading from the sensor. As a failsafe, the unit continues operating cooling mode using a fixed assumed room temperature of 32 degrees Celsius instead of shutting down.
Can I fix the 1 blink error on my Daewoo air conditioner myself?
A knowledgeable DIYer can start by inspecting the room thermistor wiring for visible damage, loose connectors, or corrosion, and reseating any loose plugs. Testing the thermistor resistance with a multimeter requires only basic tools. Replacing the thermistor itself is generally a straightforward repair if the wiring is accessible. However, if the control board is at fault, replacement is more involved and may warrant a qualified technician.
Is it safe to keep running my Daewoo air conditioner with the 1 blink error active?
The unit is designed to continue running in this condition using the fixed 32 degree Celsius reference, so there is no immediate safety hazard. However, the unit will not regulate temperature accurately and may run the compressor for extended periods without reaching your set temperature. It is best to diagnose and correct the fault promptly to avoid unnecessary wear on the compressor and increased energy consumption.
Will resetting my Daewoo air conditioner clear the 1 blink error?
A power reset will typically clear the active fault code display temporarily, but the error will return as soon as the control board checks the thermistor signal again at startup. The underlying fault, whether a failed sensor, broken wire, or bad connection, must be physically corrected before the code will stay cleared. Do not rely on repeated resets as a long-term solution.
How much does it cost to repair the 1 blink room sensor error on a Daewoo air conditioner?
If only the room thermistor needs replacement, parts costs are typically low, generally in the range of a few dollars to around 20 to 40 dollars depending on availability. Adding professional labor for diagnosis and replacement can bring the total to roughly 80 to 200 dollars depending on your location and the technician's rates. If the control board is at fault, the cost increases significantly, with board replacement commonly ranging from 150 to 400 dollars or more for parts and labor combined.

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