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Error code reference

Daewoo Air Conditioner Error Code continuous ON blink

Room sensor open or short

Daewoo codesDaewoo air conditioner codes

Room sensor open or short — unit continues working, fixing room temperature to 32°C in cooling mode.

First step from the service manual

Check room sensor for open or short circuit; Micom input voltage 0~0.3V indicates open, 4.7~5.0V indicates short.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What continuous ON blink means on a Daewoo air conditioner

The continuous ON blink error on a Daewoo air conditioner indicates a fault with the room temperature sensor, also called the room sensor or indoor air sensor. This sensor provides the Micom (microcomputer control board) with real-time ambient temperature data so the unit can regulate cooling or heating output. When the Micom detects that the sensor signal has fallen outside the expected voltage range, it registers an open or short circuit condition and triggers the continuous blink pattern on the display or indicator panel.

To determine whether the fault is an open or short circuit, the Micom input voltage at the sensor terminal is the key diagnostic reference. A reading of 0 to 0.3V indicates an open circuit, meaning the electrical path through the sensor has been broken, typically due to a disconnected connector, broken wire, or a sensor that has failed to infinite resistance. A reading of 4.7 to 5.0V indicates a short circuit, meaning the sensor or its wiring has developed a low-resistance path to voltage, which drives the signal rail high.

Despite the fault, the Daewoo unit is designed to continue operating rather than shutting down completely. As a failsafe, the Micom fixes the target room temperature reference to 32 degrees Celsius in cooling mode, allowing the unit to run but without accurate temperature regulation. This means the compressor and fan will continue to operate, but the system cannot properly respond to actual room conditions. The unit will not achieve efficient or accurate temperature control until the sensor fault is resolved.

Source: manufacturer service documentation.

Common causes of continuous ON blink

  1. 01

    Failed room temperature sensor

    Part replacement

    The sensor itself has degraded internally, producing a resistance value outside the normal operating range. This causes the Micom input voltage to drop near 0V (open) or rise near 5V (short), both of which trigger the fault.

  2. 02

    Disconnected or loose sensor connector

    Wiring / connection

    The connector linking the room sensor to the control board may have worked loose due to vibration or during previous servicing. A disconnected connector presents as an open circuit with Micom input voltage reading 0 to 0.3V.

  3. 03

    Damaged or broken sensor wiring

    Part replacement

    The wire harness between the room sensor and the Micom board can crack, fray, or break, particularly where the harness is routed around sharp edges or moving components. A broken wire results in an open circuit condition.

  4. 04

    Short circuit in sensor wiring

    Part replacement

    Wiring insulation that has worn through can allow the sensor signal wire to contact a voltage source, pushing the Micom input to 4.7 to 5.0V and registering a short circuit fault. Inspect the harness for pinching or insulation damage.

  5. 05

    Corroded sensor or connector terminals

    Wiring / connection

    Moisture exposure inside the indoor unit can cause corrosion at the sensor terminals or connector pins, increasing resistance to the point where the circuit reads as open. Cleaning or replacement of the affected connector may be required.

See the test procedure for each cause

Frequently asked questions about continuous ON blink

What does continuous ON blink mean on a Daewoo air_conditioner?
The continuous ON blink code indicates that the Micom has detected an open or short circuit in the room temperature sensor circuit. When the sensor input voltage reads 0 to 0.3V, the sensor circuit is open; when it reads 4.7 to 5.0V, the circuit is shorted. The unit continues to operate but locks its room temperature reference to 32 degrees Celsius in cooling mode, so accurate temperature control is lost until the fault is corrected.
Can I fix the continuous ON blink error myself on a Daewoo air conditioner?
A knowledgeable DIYer can start by visually inspecting the room sensor connector and wiring harness for loose connections, visible damage, or corrosion. Measuring the Micom input voltage at the sensor terminal with a multimeter will confirm whether the fault is an open or short circuit. If the sensor itself has failed, replacing it requires purchasing the correct replacement sensor for your specific model. Any work involving internal electrical components should only be performed by someone comfortable working safely with electronics.
Is it safe to keep running my Daewoo air conditioner when the continuous ON blink error is active?
The unit is designed to continue operating during this fault, so it will not shut down on its own. However, because the room temperature reference is fixed at 32 degrees Celsius, the system cannot properly regulate cooling output to match actual room conditions. Running it in this state means reduced efficiency and inaccurate temperature control. It is advisable to address the sensor fault promptly rather than leaving the unit running in this degraded mode for an extended period.
How much does it cost to repair the continuous ON blink error on a Daewoo air conditioner?
If the issue is simply a loose connector, there may be no parts cost involved, only a service call fee if a technician performs the work. If the room temperature sensor needs replacement, parts costs typically range from a small amount up to moderate pricing depending on the model and parts availability. A full diagnostic and repair service call from a technician would generally range from moderate to higher depending on your location and the extent of the wiring damage involved.
Will resetting my Daewoo air conditioner clear the continuous ON blink error?
A power reset will not permanently clear this error because the Micom will detect the sensor fault again as soon as it checks the input voltage on startup. The continuous blink will return immediately if the underlying open or short circuit in the room sensor is still present. The error will only clear once the root cause, whether a failed sensor, broken wire, or faulty connection, has been diagnosed and corrected.

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