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

The 1 blink in an 8-second cycle is a fault code indicating the room air temperature thermistor has either an open circuit or a short circuit condition. The control board cannot obtain a valid temperature reading from the sensor. As a failsafe, the unit continues operating cooling mode using a fixed assumed room temperature of 32 degrees Celsius instead of shutting down.

The unit is designed to continue running in this condition using the fixed 32 degree Celsius reference, so there is no immediate safety hazard. However, the unit will not regulate temperature accurately and may run the compressor for extended periods without reaching your set temperature. It is best to diagnose and correct the fault promptly to avoid unnecessary wear on the compressor and increased energy consumption.

If only the room thermistor needs replacement, parts costs are typically low, generally in the range of a few dollars to around 20 to 40 dollars depending on availability. Adding professional labor for diagnosis and replacement can bring the total to roughly 80 to 200 dollars depending on your location and the technician's rates. If the control board is at fault, the cost increases significantly, with board replacement commonly ranging from 150 to 400 dollars or more for parts and labor combined.

A knowledgeable DIYer can start by inspecting the room thermistor wiring for visible damage, loose connectors, or corrosion, and reseating any loose plugs. Testing the thermistor resistance with a multimeter requires only basic tools. Replacing the thermistor itself is generally a straightforward repair if the wiring is accessible. However, if the control board is at fault, replacement is more involved and may warrant a qualified technician.

A power reset will typically clear the active fault code display temporarily, but the error will return as soon as the control board checks the thermistor signal again at startup. The underlying fault, whether a failed sensor, broken wire, or bad connection, must be physically corrected before the code will stay cleared. Do not rely on repeated resets as a long-term solution.