Daewoo Air Conditioner Error Code 1 blink (8s interval)

This blink pattern indicates that the control board has detected an open or short circuit fault in the indoor coil temperature sensor, the outdoor coil temperature sensor, or both. The unit will not operate while this fault is active to prevent damage to the system. The fault is detected through the thermistor resistance being outside the expected range for normal operating conditions. A physical check of the indoor coil thermistor mounting is the recommended first step.

No, the unit is designed to shut itself down completely when this fault is detected and will not operate until the fault is cleared. Attempting to bypass the fault is not recommended, as the coil temperature sensors protect the system from freezing, overheating, and compressor damage. The unit should remain off until the thermistor fault is diagnosed and resolved.

A power reset may temporarily clear the fault code, but if the underlying sensor fault still exists, the blink code will return as soon as the control board performs its startup diagnostics. A reset alone does not fix the problem. The thermistor circuit needs to be inspected and the root cause corrected before the unit will operate normally and remain fault-free.

If the indoor coil thermistor has simply come loose from its clip on the evaporator coil, reseating it is a straightforward repair a knowledgeable homeowner can attempt after removing the indoor unit cover. However, if the sensor has failed electrically or the wiring is damaged, resistance testing with a multimeter is required to confirm the fault, and component replacement may be needed. Working inside the air conditioner unit involves electrical components, so the unit should be powered off at the breaker before any inspection.

If the repair is only a reseating of the thermistor clip, the cost is primarily a service call fee, which typically ranges from $60 to $120 depending on your location. If a thermistor sensor needs to be replaced, parts and labor combined generally range from $80 to $200. If wiring harness damage or a control board fault is involved, costs can be higher.