Daewoo Air Conditioner Error Code LED 8s blink

The LED 8-second blink code indicates that the microcomputer has detected an open or short circuit fault in one of three temperature sensor circuits: the room sensor, the indoor coil sensor, or the outdoor coil sensor. An open condition produces a micom input voltage of 0 to 0.3V, while a short condition produces 4.7 to 5.0V. The unit stops normal operation until the faulty sensor circuit is identified and repaired to prevent the system from running on bad temperature data.

No. The unit uses the sensor readings to control compressor operation, refrigerant flow, and coil temperatures. Running the system without valid sensor data can lead to the compressor operating outside safe parameters, potentially causing refrigerant or compressor damage. It is best to leave the unit off until the sensor fault is diagnosed and repaired.

Repair costs vary depending on which component has failed. A replacement NTC thermistor sensor is typically an inexpensive part, with the sensor itself ranging from around $10 to $40, plus labor. If the control board has failed, the cost rises significantly, often falling between $150 and $400 or more including parts and labor. Connector cleaning or harness repair may cost only a service call fee if no parts are needed.

A knowledgeable DIYer can perform basic checks such as inspecting sensor connectors for looseness or visible corrosion and reseating them, which sometimes resolves the fault. However, measuring micom input voltage and thermistor resistance accurately requires a multimeter and comfort working near live electrical components. Replacing a control board or tracing a damaged harness inside the unit is generally better handled by a qualified technician.

A power reset may temporarily clear the fault display, but if the underlying sensor circuit problem still exists, the error will return as soon as the micom re-checks the sensor input voltages. The fault needs to be corrected at the source, whether that is a failed thermistor, damaged wiring, or a loose connector, before the code will stay cleared.