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Error code reference

Daewoo Air Conditioner Error Code E1

Room sensor open or short circuit detected (ON lamp blinks continuously for 8 seconds pattern).

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Room sensor open or short circuit detected (ON lamp blinks continuously for 8 seconds pattern).

First step from the service manual

Check Micom input voltage: Open condition = 0~0.3V, Short condition = 4.7~5.0V at sensor input.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What E1 means on a Daewoo air conditioner

The E1 error code on a Daewoo air conditioner indicates that the Micom (microcomputer controller) has detected a fault in the room temperature sensor circuit. The room sensor is a thermistor, a resistive component whose resistance value changes predictably with temperature. The Micom continuously monitors the voltage at the sensor input pin to interpret room temperature readings. When that voltage falls outside the expected operating range, the controller flags the circuit as either open or shorted and triggers the E1 fault. The fault is signaled visually by the ON lamp blinking in a continuous 8-second repeating pattern.

The Micom uses a reference voltage to evaluate the sensor input. Under normal operation, the sensor input voltage sits in a mid-range value reflecting the thermistor's current resistance. An open circuit condition, meaning a broken wire, corroded connector, or failed thermistor with infinite resistance, pulls the input voltage down to the 0 to 0.3V range. A short circuit condition, meaning a direct connection to voltage through a shorted thermistor or wiring fault, drives the input up to the 4.7 to 5.0V range. Both conditions make accurate temperature measurement impossible, so the unit halts normal operation.

The most useful first diagnostic step is measuring the Micom sensor input voltage directly. A reading of 0 to 0.3V points toward an open circuit: check the thermistor itself and all wiring between the sensor and the control board. A reading of 4.7 to 5.0V points toward a short: inspect the sensor harness for pinched or damaged wiring and test the thermistor resistance directly with a multimeter. A healthy thermistor typically shows several kilohms of resistance at room temperature, and that value should shift predictably when the component is warmed or cooled.

Source: manufacturer service documentation.

Common causes of E1

  1. 01

    Failed room thermistor

    Part replacement

    The thermistor itself has degraded or broken internally, producing a resistance value that reads as either open or shorted. Testing the component directly with a multimeter and comparing the reading to expected resistance values at room temperature will confirm this.

  2. 02

    Corroded or disconnected sensor connector

    Wiring / connection

    Moisture or vibration can cause the sensor harness connector to corrode or pull loose from the control board or sensor housing. Inspect the connector pins for oxidation, green discoloration, or physical separation from the socket.

  3. 03

    Damaged sensor wiring harness

    Wiring / connection

    The wiring between the room sensor and the Micom board can be pinched, cut, or abraded during installation or servicing, creating an open or short in the circuit. Visually trace the harness and check for any areas where insulation is worn through.

  4. 04

    Control board Micom input circuit fault

    Part replacement

    If the sensor and wiring test normal, the fault may lie in the input circuitry on the Micom board itself, such as a damaged pull-up resistor or failed input pin. This is less common but should be considered after ruling out the sensor and harness.

  5. 05

    Moisture or contamination at sensor housing

    Wiring / connection

    Water ingress around the sensor location can temporarily short the sensor circuit or accelerate corrosion of the thermistor leads. Inspect the sensor mounting area for signs of water damage or residue.

See the test procedure for each cause

Frequently asked questions about E1

What does E1 mean on a Daewoo air_conditioner?
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.
Can I fix the E1 error on my Daewoo air conditioner myself?
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.
Is it safe to keep running my Daewoo air conditioner with an E1 error?
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.
How much does it cost to repair an E1 error on a Daewoo air conditioner?
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.
Will resetting my Daewoo air conditioner clear the E1 error?
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.

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