Daewoo Air Conditioner Error Code 1

Error code 1 on a Daewoo air conditioner indicates a fault in the room air thermistor circuit, specifically an open or short circuit condition. The room air thermistor is the sensor that measures indoor ambient temperature and sends that data to the control board. When the board cannot read a valid resistance signal from this sensor, it triggers code 1 and may halt normal operation.

Running the unit with error code 1 active is not recommended. Without a valid room temperature reading, the control board cannot regulate cooling accurately, which may lead to the unit running outside its intended parameters. The unit may also refuse to operate normally while the fault is detected.

A power reset may temporarily clear the displayed error code, but if the underlying fault in the thermistor, its wiring, or its connector is still present, the code will return once the unit reinitializes and checks the circuit again. The fault must be physically diagnosed and corrected to clear the code permanently.

Some causes of error code 1 are accessible to a knowledgeable DIYer. Checking and reseating the thermistor connector, inspecting the wiring harness for visible damage, and measuring thermistor resistance with a multimeter are reasonable first steps. If the thermistor has failed or a PCB solder joint needs repair, more technical skill or professional assistance may be needed.

Repair costs depend on the root cause. If only the connector needs reseating or cleaning, there may be no parts cost, with a service call ranging from $50 to $150. Replacing a failed thermistor typically costs $10 to $40 for the part plus labor. Control PCB repair or replacement can range from $80 to $250 or more depending on board availability.