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Daewoo Air Conditioner Error Code Continuous ON lamp blink

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

Daewoo codesDaewoo air conditioner codes

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

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What Continuous ON lamp blink means on a Daewoo air conditioner

The continuous ON lamp blink on a Daewoo air conditioner signals a fault condition with the room temperature sensor, also called the indoor air thermistor. This sensor is a negative temperature coefficient (NTC) resistor that changes resistance in response to ambient temperature, allowing the control board to regulate cooling output. When the sensor circuit reads outside the expected resistance range, either because the sensor has failed open (infinite resistance) or short circuit (near-zero resistance), the control board registers a fault and triggers the continuous lamp blink to alert the user.

Despite the fault, the unit does not shut down entirely. Instead, Daewoo has programmed a failsafe mode into the control logic: the unit continues operating but substitutes a fixed assumed room temperature of 32°C in cooling mode. This means the compressor and fan will run as though the room is always at 32°C, regardless of actual conditions. This can result in overcooling or inefficient operation, and the unit will not properly cycle based on real room temperature until the sensor fault is resolved.

The most common physical causes include a broken sensor wire, a corroded or disconnected connector at the control board, or a thermistor that has drifted out of specification due to age or moisture exposure. The sensor is typically mounted on the indoor unit's evaporator inlet area to sample return air temperature. Verifying the sensor's resistance at room temperature against the expected value for that specific thermistor type is the standard first diagnostic step before replacing the component.

Source: manufacturer service documentation.

Common causes of Continuous ON lamp blink

  1. 01

    Failed room temperature thermistor

    Part replacement

    The NTC thermistor itself has failed open or shorted internally, producing a resistance reading outside the normal operating range. This is the most frequent cause and is confirmed by measuring the sensor's resistance with a multimeter and comparing it to the specified value.

  2. 02

    Disconnected or loose sensor connector

    Wiring / connection

    The wiring connector between the room sensor and the control board may have worked loose due to vibration or handling. Inspect the connector at both the sensor end and the board end for secure seating.

  3. 03

    Damaged sensor wiring

    Part replacement

    The wiring harness leading to the room sensor may have a break, pinch, or chafe point that creates an open or intermittent circuit. Visually inspect the full length of the sensor wire for cuts, kinks, or signs of rodent damage.

  4. 04

    Moisture or corrosion at the sensor connector

    Wiring / connection

    Condensation or humidity inside the indoor unit can cause corrosion at the sensor connector pins, increasing resistance enough to simulate an open circuit fault. Clean corroded contacts carefully and reseat the connector.

  5. 05

    Faulty control board sensor input circuit

    Part replacement

    If the thermistor and wiring both test correctly, the sensor input circuit on the main control board may have failed. This is less common but should be considered after ruling out the sensor and wiring.

See the test procedure for each cause

Frequently asked questions about Continuous ON lamp blink

What does Continuous ON lamp blink mean on a Daewoo air_conditioner?
The continuous ON lamp blink indicates that the room temperature sensor has been detected as either open circuit or short circuit by the control board. The unit enters a failsafe mode and continues to operate with the room temperature fixed at 32°C in cooling mode rather than shutting down completely. This means cooling performance will be inaccurate until the sensor fault is corrected. A technician should inspect and test the sensor and its wiring to diagnose the root cause.
Can I still use my Daewoo air conditioner while the ON lamp is blinking continuously?
The unit will continue running in its failsafe mode, assuming a fixed room temperature of 32°C, so it is not immediately dangerous to operate. However, because it cannot read actual room temperature, it will not cycle correctly and may overcool or run inefficiently. Extended operation in this condition is not recommended, as it can increase energy consumption and may mask further developing issues.
Will resetting my Daewoo air conditioner clear the continuous ON lamp blink?
A power reset may temporarily clear the fault indication, but if the room temperature sensor is genuinely open or shorted, the fault will return quickly once the control board attempts to read the sensor again. A reset alone does not fix the underlying hardware problem. The sensor, connector, and wiring need to be physically inspected and tested to resolve the fault permanently.
How much does it cost to fix the continuous ON lamp blink fault on a Daewoo air conditioner?
Repair costs vary depending on whether the issue is a simple connector reseating or a full sensor replacement. A replacement room temperature thermistor typically costs between $10 and $40 for the part. Adding professional labor for diagnosis and replacement, total repair costs generally range from $75 to $200 depending on your location and the technician's rates.
Is the continuous ON lamp blink fault on my Daewoo air conditioner a safety risk?
A failed room sensor is not a direct safety hazard, as the unit is designed to continue operating in failsafe mode rather than behaving unpredictably. However, operating the unit long-term without accurate temperature feedback can lead to excessive cooling and increased energy use. It is best to have the fault diagnosed and repaired promptly to restore normal, efficient operation.

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