Daewoo Air Conditioner Error Code continuous ON blink

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.

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.

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.

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.

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.