Daewoo Air Conditioner Error Code 1 blink

A 1 blink error on a Daewoo air conditioner indicates one of three fault conditions: an open or short circuit in the indoor coil sensor, the same fault in the outdoor coil sensor, or an error related to the compressor or its electrical parts. In all cases, the unit will stop operating until the fault is diagnosed and corrected. Technicians determine the specific cause by measuring the Micom sensor input voltage and monitoring indoor coil temperature during compressor operation.

No. The 1 blink error causes the unit to shut down and not operate, which is the system protecting itself from running in a faulty or unsafe condition. You should not attempt to force the unit to run while this fault is active. Leave the unit powered down until the fault has been properly diagnosed and resolved.

Repair costs depend on which component is at fault. Replacing a coil temperature sensor is generally a lower-cost repair, typically in the range of $50 to $150 including parts and labor. Compressor replacement or refrigerant service is significantly more expensive, often ranging from $300 to $800 or more depending on the unit size and local labor rates. Getting a proper diagnosis first will help avoid unnecessary parts replacement.

Some causes, such as a loose sensor connector, can be checked by a knowledgeable DIYer after safely disconnecting power to the unit. However, diagnosing the fault accurately requires a multimeter to measure sensor circuit voltages and the ability to monitor coil temperatures during compressor operation, which goes beyond basic DIY skill. Compressor and refrigerant-related faults should be handled by a certified technician.

A power reset may temporarily clear the error display, but it will not fix the underlying problem. If the sensor is failed, the wiring is damaged, or the compressor has a fault, the 1 blink code will return once the unit attempts to operate again. The root cause must be identified and corrected for the error to clear permanently.