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Error code reference

Midea Air Conditioner Error Code HS

Open or short circuit of exhaust temperature sensor (T5 or T6).

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Open or short circuit of exhaust temperature sensor (T5 or T6).

First step from the service manual

Check the connection between temperature sensor and PCB. If properly connected, measure the resistance value of the sensor.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What HS means on a Midea air conditioner

The HS error code on a Midea air conditioner indicates an open or short circuit condition detected in the exhaust temperature sensor circuit, specifically at sensor T5 or T6. These sensors monitor the discharge or exhaust gas temperature at the compressor outlet or heat exchanger, providing critical thermal feedback to the PCB (printed circuit board) that controls compressor operation and protects the system from overheating. When the PCB reads a resistance value outside the expected range for the sensor, it interprets this as either an open circuit (infinite or very high resistance, usually caused by a broken wire or failed sensor element) or a short circuit (near-zero resistance, typically caused by damaged insulation or a shorted sensor).

The T5 and T6 sensors are thermistor-based devices, meaning their electrical resistance changes predictably with temperature. The PCB continuously monitors this resistance to calculate real-time temperature values. An open circuit condition causes the PCB to read an implausibly high temperature or no signal at all, while a short circuit causes it to read an implausibly low temperature. Either condition triggers the HS fault code and typically shuts down compressor operation to prevent damage.

The first diagnostic step is to inspect the wiring harness connecting the sensor to the PCB, checking for loose connector pins, corrosion, or visibly damaged insulation. If the connection appears intact, the next step is to disconnect the sensor and measure its resistance with a multimeter at a known ambient temperature. A reading of near zero ohms confirms a short, while a reading of infinite resistance (OL on a multimeter) confirms an open circuit. If resistance is within the expected range for the ambient temperature, the fault may lie in the wiring harness or the PCB input circuit itself.

Source: manufacturer service documentation.

Common causes of HS

  1. 01

    Loose or corroded sensor connector

    Wiring / connection

    The connector linking the T5 or T6 sensor to the PCB can work loose over time due to vibration, or corrode due to moisture exposure. This is the most common cause and should be inspected first by reseating the connector and checking the pins.

  2. 02

    Failed temperature sensor (open circuit)

    Part replacement

    The thermistor element inside the T5 or T6 sensor can fail internally, breaking the circuit and causing an infinite resistance reading. Disconnecting the sensor and measuring resistance with a multimeter will confirm this if the reading shows OL (overload or no continuity).

  3. 03

    Shorted temperature sensor

    Part replacement

    Physical damage, moisture ingress, or heat degradation can cause the sensor to short internally, resulting in a near-zero resistance reading. A multimeter measurement directly across the sensor terminals will confirm a short circuit condition.

  4. 04

    Damaged wiring harness

    Part replacement

    The wires running between the sensor and the PCB can become pinched, chafed, or broken, especially where they route around sheet metal edges inside the unit. Visually inspect the full length of the harness and use a multimeter to check for continuity and shorts to ground.

  5. 05

    Faulty PCB sensor input circuit

    Part replacement

    If the sensor and its wiring both test within normal resistance values, the fault may lie in the PCB input circuit responsible for reading the sensor signal. This is the least common cause and is typically diagnosed after all other components have been ruled out.

See the test procedure for each cause

Frequently asked questions about HS

What does HS mean on a Midea air conditioner?
The HS code on a Midea air conditioner means the control board has detected an open or short circuit in the exhaust temperature sensor circuit, at sensor T5 or T6. These sensors track the temperature of gases exiting the compressor and are critical for protecting the system from overheating. The unit will typically stop operating until the fault is resolved. A technician should inspect the sensor wiring and measure the sensor resistance to locate the fault.
Can I fix the HS error code myself?
A homeowner comfortable with basic electrical checks can inspect the sensor wiring connector for looseness or corrosion and reseat it, which sometimes clears the fault. However, measuring sensor resistance, diagnosing wiring faults, and replacing PCB components requires a multimeter and technical knowledge. If the sensor or PCB needs replacement, it is recommended to have a qualified technician perform the repair to avoid damaging the system.
Is it safe to keep running my Midea air conditioner with the HS error?
No, you should not attempt to bypass or ignore the HS fault and continue operating the unit. The exhaust temperature sensors exist to protect the compressor from overheating, and running the system without reliable sensor feedback can lead to compressor damage, which is a significantly more costly repair. Leave the unit off until the fault is diagnosed and corrected.
How much does it cost to repair the HS error on a Midea air conditioner?
Repair costs depend on the root cause. If only a connector needs reseating, there may be no parts cost at all, just a service call fee typically in the range of $75 to $150. Replacing a faulty T5 or T6 temperature sensor usually costs between $50 and $150 in parts plus labor. If the PCB requires replacement, total costs can range from $200 to $600 or more depending on the unit model and local labor rates.
Will resetting my Midea air conditioner clear the HS error code?
A power reset may temporarily clear the HS code, but if the underlying sensor or wiring fault still exists, the code will return once the unit attempts to operate and reads the faulty signal again. Resetting without repairing the root cause does not fix the problem and can delay proper diagnosis. The sensor connection and resistance values should be checked before assuming a reset has resolved the issue.

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