Daewoo Air Conditioner Error Code 1 blink (0.5s cycle)

This blink pattern indicates an open or short circuit has been detected in the outdoor coil sensor circuit. The outdoor coil sensor is a thermistor that monitors heat exchanger temperature and provides data the system uses for defrost and compressor protection. Notably, the unit continues to operate under this fault rather than shutting down. The sensor and its wiring connections should be inspected and tested as soon as possible.

The unit will continue running with this code active, so there is no immediate safety hazard in most cases. However, without accurate outdoor coil temperature data, the system may not perform defrost cycles correctly and could operate outside ideal conditions over time. It is best to have the fault diagnosed and corrected within a reasonable timeframe rather than leaving it unaddressed.

A power reset may temporarily clear the blink code, but if the underlying sensor or wiring fault still exists, the code will return once the unit resumes operation and the control board re-checks the sensor circuit. Resetting without repairing the root cause is not a reliable fix. The sensor connections and sensor resistance should be verified before assuming the fault is resolved.

If the issue is a loose connector, a knowledgeable DIYer can safely disconnect power to the outdoor unit and reseat the sensor harness connector. Testing the thermistor with a multimeter to check for an out-of-range or open reading is also within reach for someone comfortable with basic electrical diagnostics. However, if the control board or refrigerant-side components are involved, a licensed technician should handle the repair.

If the fix is simply reseating a loose connector or cleaning corroded pins, there may be no parts cost at all, with labor charges typically ranging from $50 to $150 depending on your area. If the thermistor itself needs replacement, parts generally cost between $10 and $50, bringing total repair costs to roughly $60 to $200. A control board replacement, if needed in rare cases, would increase costs significantly.