Daewoo Air Conditioner Error Code E1

E1 on a Daewoo air conditioner means the Micom controller has detected an open or short circuit in the room temperature sensor circuit. The unit cannot read room temperature accurately in this condition and will not operate normally. The fault is indicated by the ON lamp blinking continuously in an 8-second repeating pattern. Checking the sensor input voltage at the Micom is the correct first step, with 0 to 0.3V indicating an open and 4.7 to 5.0V indicating a short.

Running the unit while E1 is active is not recommended. Without a functioning room sensor, the controller cannot regulate cooling cycles properly, which could lead to inadequate cooling or potential stress on system components. The unit will typically restrict normal operation when this fault is present, so continued use until the sensor circuit is repaired is inadvisable.

A power reset may temporarily clear the E1 display, but the error will return if the underlying sensor circuit fault has not been corrected. The Micom continuously monitors the sensor input voltage during operation, so any persistent open or short condition will trigger E1 again shortly after the unit restarts. A lasting fix requires identifying and repairing the actual fault in the sensor or wiring.

Some causes of E1, such as a loose connector or visibly damaged wiring, can be addressed by a knowledgeable DIYer with basic electrical tools. Testing the room thermistor with a multimeter and checking connector integrity are reasonable first steps. However, if the control board itself is faulty or you are not comfortable working with electrical components, a qualified technician should perform the diagnosis and repair.

Repair costs vary depending on the root cause. A replacement room thermistor sensor is generally an inexpensive part, typically in the range of a few dollars to around 30 dollars depending on the model. If the control board requires replacement, costs rise significantly, often falling in the range of 80 to 250 dollars for the part alone, plus labor if a technician is needed.