Midea Air Conditioner Error Code En

The En error code on a Midea air conditioner indicates a failure in the evaporator temperature sensor circuit. This sensor, also called the evaporator coil thermistor, monitors the temperature of the indoor evaporator coil and feeds that data to the main control board. The control board uses this input to regulate refrigerant flow, prevent coil icing, and maintain efficient cooling cycles. When the board detects a reading that falls outside acceptable parameters, it logs the En fault and halts normal operation to prevent potential damage.

The fault can result from either an open circuit or a short circuit condition in the sensor or its wiring. An open circuit means the electrical path is broken, which causes the control board to read an abnormally high resistance value or no signal at all. A short circuit means two conductors are making unintended contact, causing the board to read an abnormally low resistance value. Both conditions produce invalid temperature data that the system cannot use safely.

Diagnosing En starts with a physical inspection of the sensor wiring harness for visible damage such as pinched wires, corrosion at connectors, or loose terminals. After confirming wiring integrity, the sensor itself should be tested with a multimeter. A healthy evaporator thermistor typically shows a resistance value that changes predictably with temperature. A reading of zero ohms indicates a short, while an open line or reading of infinite resistance confirms an open circuit failure. If wiring checks out but resistance is out of spec, the sensor requires replacement.