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Error code reference

Daewoo Air Conditioner Error Code E2

Indoor coil sensor or outdoor coil sensor open or short circuit (ON lamp does not blink/does not work).

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Indoor coil sensor or outdoor coil sensor open or short circuit (ON lamp does not blink/does not work).

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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  • Wiring diagram references and connector pinouts from the OEM service manual
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What E2 means on a Daewoo air conditioner

The E2 error code on a Daewoo air conditioner indicates a fault in the indoor coil sensor (also called the indoor pipe sensor) or the outdoor coil sensor. These thermistor-based sensors monitor refrigerant coil temperatures and feed that data to the microcomputer (Micom) control board, which uses the readings to regulate compressor operation, defrost cycles, and overall system efficiency. When the Micom detects that the sensor signal is outside of its expected operating range, it triggers the E2 fault and halts normal operation.

The Micom reads the sensor input voltage to determine the type of fault. Under normal conditions, the sensor produces a voltage in the mid-range as the thermistor varies resistance with temperature. An open circuit condition, caused by a broken wire, corroded connector, or failed thermistor, drives the input voltage down to between 0 and 0.3V. A short circuit condition, caused by a sensor lead-to-lead short or internal thermistor failure, drives the input voltage up to between 4.7 and 5.0V. Either condition tells the Micom the sensor data is unreliable, and the unit shuts down the affected circuit.

A notable characteristic of this fault is that the ON lamp does not blink and does not work during an E2 condition, which differentiates it from other error codes where indicator lights may flash in specific patterns. Diagnosis begins at the sensor input terminals on the Micom board using a multimeter to confirm whether the voltage is at the low end (open fault) or high end (short fault) of the 0 to 5V reference range. From there, the technician can trace the fault back to the wiring harness, connector, or the sensor component itself.

Source: manufacturer service documentation.

Common causes of E2

  1. 01

    Failed thermistor sensor

    Part replacement

    The thermistor element inside the coil sensor degrades or burns out over time, causing the resistance to go out of range. Measuring resistance across the sensor at a known temperature and comparing it to specifications will confirm this failure.

  2. 02

    Broken or damaged sensor wire

    Part replacement

    The wire between the coil sensor and the Micom board can break internally due to vibration, pinching, or age, producing an open circuit and a 0 to 0.3V reading at the Micom input. Carefully inspect the full length of the harness for kinks, cuts, or fraying.

  3. 03

    Corroded or loose connector

    Wiring / connection

    The sensor connector pins can corrode or back out of the housing, causing intermittent or permanent open circuit conditions. Inspect the connector at both the sensor end and the control board end for discoloration, bent pins, or poor seating.

  4. 04

    Short circuit in sensor wiring

    Wiring / connection

    If two sensor lead wires contact each other or a grounded surface, the Micom input voltage rises to the 4.7 to 5.0V range, indicating a short. Check the wiring harness for areas where insulation has worn away and wires may be touching.

  5. 05

    Faulty Micom control board

    Part replacement

    If the sensor and wiring check out correctly but the voltage at the Micom input is still out of the normal range, the control board's sensor input circuit may be damaged. This is the least common cause and should only be considered after the sensor and harness have been ruled out.

See the test procedure for each cause

Frequently asked questions about E2

What does E2 mean on a Daewoo air_conditioner?
The E2 code means the Micom control board has detected an open or short circuit in either the indoor coil sensor or the outdoor coil sensor. The board checks the sensor input voltage, and a reading of 0 to 0.3V confirms an open circuit while a reading of 4.7 to 5.0V confirms a short circuit. The unit will not operate normally until the fault is resolved. A distinctive sign of this code is that the ON indicator lamp does not blink and does not illuminate.
Can I fix the E2 error on my Daewoo air conditioner myself?
A knowledgeable DIYer can inspect the sensor wiring harness and connectors for obvious damage such as broken wires, corrosion, or loose pins without specialized tools. However, accurately diagnosing the fault requires a multimeter to check the Micom input voltage and sensor resistance. Replacing a coil sensor is a straightforward repair, but working near the refrigerant lines and control board requires care, and some situations may warrant a qualified technician.
Is it safe to keep running my Daewoo air conditioner with an E2 error?
No, you should not attempt to force the unit to run while the E2 error is active. The coil sensors protect the system from operating outside safe temperature limits, and without accurate sensor data, the compressor and refrigerant circuit could be damaged. Turn the unit off and diagnose the fault before resuming operation.
Will resetting my Daewoo air conditioner clear the E2 error?
A power reset may temporarily clear the error display, but if the underlying sensor or wiring fault still exists, the E2 code will return once the Micom checks the sensor input again. A reset does not repair a failed thermistor, broken wire, or corroded connector. The fault must be properly diagnosed and repaired to permanently clear the code.
How much does it cost to repair a Daewoo E2 sensor error?
If only the coil sensor needs replacement, parts typically cost in the range of $15 to $60 depending on the specific model and whether it is the indoor or outdoor sensor. If the repair requires a service technician for diagnosis and labor, the total cost could range from $80 to $200 or more. A damaged Micom control board, if found to be the root cause, will be the most expensive repair scenario.

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