Daewoo Air Conditioner Error Code 1 blink (8s)

The 1 blink (8s) code indicates that the indoor coil thermistor has been detected as either open or short-circuited. This thermistor monitors the temperature of the evaporator coil and is essential for safe operation. Because the control board cannot trust the temperature data, the unit shuts down completely until the fault is resolved.

The unit is designed to stop operating when this error is active, so continued running is not possible without repairing the fault first. Attempting to bypass the fault is not recommended, as the coil temperature sensor protects the system from freeze-up and other damage that can occur without accurate thermal feedback.

A power reset may temporarily clear the error code, but if the underlying thermistor fault is still present, the code will return as soon as the control board runs its diagnostic checks. Permanent resolution requires identifying and correcting the actual fault in the sensor, wiring, or connector before the reset will hold.

Some causes of this error are DIY-accessible, such as reseating a dislodged thermistor back into its coil clip or firmly reconnecting a loose wiring harness connector. If the thermistor itself has failed, the sensor can often be replaced at moderate cost without specialized tools. However, if the control board is at fault, professional diagnosis is recommended before investing in a board replacement.

Repair costs vary depending on the root cause. If the thermistor only needs to be repositioned or a connector reseated, there may be no parts cost and only a service call fee, typically in the range of $75 to $150. Replacing the thermistor sensor itself usually adds $15 to $60 in parts. A control board replacement, if required, can range from $150 to $400 or more depending on the model.