Daewoo Air Conditioner Error Code E2

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.

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.

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.

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.

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.