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Error code reference

Midea Air Conditioner Error Code LO

Room temperature is lower than 32°F (below display range).

Midea codesMidea air conditioner codes

Room temperature is lower than 32°F (below display range).

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What LO means on a Midea air conditioner

The LO error code on a Midea air conditioner indicates that the room temperature sensor is reading a value below 32°F (0°C), which falls outside the unit's displayable and operable temperature range. The system relies on a negative temperature coefficient (NTC) thermistor, typically located on the indoor unit's return air path, to continuously monitor ambient room temperature. When the sensor reading drops below this threshold, the unit flags it as an out-of-range condition and displays LO rather than a numeric temperature value.

This condition can be caused by genuinely frigid ambient conditions, but it is more frequently triggered by a fault in the room temperature sensor circuit itself. NTC thermistors change resistance as temperature shifts, and a failed or degraded sensor can output a resistance value that the control board interprets as a sub-freezing reading even when actual room temperature is normal. Wiring issues such as a loose connector, corroded terminals, or a damaged harness between the thermistor and control board can produce the same erroneous reading.

In most cases, if the room is not actually below freezing, the sensor or its wiring circuit is the root cause and should be inspected and tested with a multimeter. A properly functioning NTC room temperature thermistor will show a specific resistance value that corresponds to ambient temperature. A reading that is wildly out of range, open, or shorted indicates the component needs replacement. The control board itself is a less common but possible cause if the sensor and wiring check out correctly.

Source: manufacturer service documentation.

Common causes of LO

  1. 01

    Faulty room temperature sensor (NTC thermistor)

    Part replacement

    The indoor NTC thermistor has failed or drifted out of spec, causing the control board to receive a resistance value it interprets as below 32°F. Test the sensor with a multimeter and compare the resistance reading to the expected value for the current room temperature.

  2. 02

    Loose or corroded sensor wiring connector

    Wiring / connection

    The connector between the room temperature thermistor and the control board may be loose, corroded, or intermittently disconnected, causing an erroneous low reading. Inspect the connector and terminals for corrosion, bent pins, or poor seating.

  3. 03

    Damaged sensor wiring harness

    Part replacement

    A pinched, cut, or chafed wire in the thermistor harness can cause an open or short circuit that mimics a below-range temperature reading. Visually trace the wiring from the sensor to the control board and check for visible damage.

  4. 04

    Actual ambient temperature below 32°F

    Wiring / connection

    If the unit is installed in an unheated space such as a garage, sunroom, or crawl area during winter, the room temperature may genuinely be at or below 32°F. Confirm the actual room temperature with a separate thermometer.

  5. 05

    Control board input circuit fault

    Part replacement

    If the thermistor and all wiring test within normal parameters, the control board's sensor input circuit may have failed, causing it to misread a correct signal. This is the least common cause and typically requires board replacement.

See the test procedure for each cause

Frequently asked questions about LO

What does LO mean on a Midea air conditioner?
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.
How do I fix the LO error code on my Midea air conditioner?
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.
Is the LO error code on a Midea air conditioner dangerous?
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.
Will resetting my Midea air conditioner clear the LO code?
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.
How much does it cost to repair a Midea air conditioner showing the LO code?
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.

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