Midea Air Conditioner Error Code LO

The LO code means the unit's room temperature sensor is reporting a reading below 32°F (0°C), which is outside the display and operating range of the air conditioner. This can result from an actual sub-freezing ambient environment or, more commonly, from a failed or malfunctioning NTC thermistor sensor. The unit displays LO instead of a numeric temperature because the reading falls below what the system is designed to handle.

The LO code is not a safety emergency. It indicates an out-of-range temperature reading rather than a hazardous electrical or mechanical condition. However, the unit may not function properly while the code is active, so it is worth diagnosing and correcting the cause in a timely manner.

Repair costs vary depending on the root cause. If only the NTC room temperature thermistor needs replacement, parts typically range from $10 to $40, plus labor if a technician is hired. If the control board is at fault, parts costs can range from $60 to $200 or more depending on the model. A diagnostic service call from a technician generally adds $75 to $150 to the total cost.

Start by confirming the actual room temperature with a separate thermometer. If the room is not below freezing, the next step is to inspect the room temperature sensor and its wiring connector inside the indoor unit for damage or loose connections. If wiring looks intact, test the NTC thermistor with a multimeter to check for an open, shorted, or out-of-range resistance reading. A failed thermistor will need to be replaced to clear the error.

A reset may temporarily clear the display, but the code will return if the underlying cause is not addressed. If the room temperature sensor is faulty or the wiring has a fault, the control board will detect the out-of-range reading again as soon as the unit restarts. A reset is only a lasting fix if the cause was a one-time glitch or a temporarily low ambient temperature.