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Error code reference

Kenmore Air Conditioner Error Code ES

Evaporator coil sensor has failed.

Kenmore codesKenmore air conditioner codes

Evaporator coil sensor has failed.

First step from the service manual

Contact 1-800-4-MY-HOME® (1-800-469-4663) for repair.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
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What ES means on a Kenmore air conditioner

The ES error code on a Kenmore air conditioner indicates a failure in the evaporator coil temperature sensor. This sensor is a thermistor, a resistive temperature-sensing device mounted directly on or near the evaporator coil. Its job is to continuously report coil temperature to the control board so the unit can regulate cooling cycles, prevent ice buildup, and protect the system from operating outside safe thermal limits. When the control board detects a reading that falls outside the expected resistance range for the sensor, it triggers the ES fault and halts normal operation.

The evaporator coil sensor is a critical feedback component in the refrigeration circuit. If the sensor reports an incorrect temperature, the control board cannot accurately determine when to cycle the compressor on or off. This can lead to coil icing, insufficient cooling, or compressor overload if left unaddressed. The fault may present as a complete shutdown of cooling or intermittent operation before the code appears on the display.

Common causes include a broken or disconnected sensor wire, corrosion at the sensor connector, a thermistor that has drifted out of its specified resistance range due to age or moisture exposure, or physical damage to the sensor itself. Because this fault involves internal electrical components and refrigeration system proximity, Kenmore directs diagnosis and repair through their service line at 1-800-4-MY-HOME (1-800-469-4663) rather than field self-service.

Source: manufacturer service documentation.

Common causes of ES

  1. 01

    Faulty or failed thermistor

    Part replacement

    The evaporator coil thermistor can fail over time due to age, moisture exposure, or thermal stress, causing its resistance to fall outside the range the control board expects. This is the most common root cause of the ES code.

  2. 02

    Disconnected or damaged sensor wiring

    Wiring / connection

    Vibration or physical contact during cleaning or filter changes can loosen or break the wiring connecting the sensor to the control board. Inspect the sensor lead and connector for visible damage or a loose connection.

  3. 03

    Corroded sensor connector

    Wiring / connection

    Moisture and condensation inside the air conditioner cabinet can cause oxidation at the sensor connector pins, increasing resistance and producing an out-of-range signal. The connector may need cleaning or replacement.

  4. 04

    Control board fault

    Part replacement

    If the sensor and its wiring test correctly, the control board itself may have a defect preventing it from accurately reading the sensor signal. This is less common but possible after a power surge or long-term use.

  5. 05

    Physical damage to the sensor

    Part replacement

    The sensor probe can be bent, cracked, or dislodged from its mounting position on the evaporator coil, especially if the unit has been moved or serviced recently. A displaced sensor produces inaccurate readings that trigger the fault.

See the test procedure for each cause

Frequently asked questions about ES

What does ES mean on a Kenmore air conditioner?
The ES code means the evaporator coil temperature sensor has failed or is sending a signal outside the acceptable range to the control board. The evaporator coil sensor is a thermistor that helps the unit regulate its cooling cycles and prevent ice buildup. When this sensor malfunctions, the air conditioner stops operating normally to protect the system. A technician will need to diagnose and replace the faulty component.
Can I fix the ES error code on my Kenmore air conditioner myself?
Kenmore directs repair of the ES fault to their service line at 1-800-4-MY-HOME (1-800-469-4663) rather than DIY troubleshooting. The repair involves accessing internal electrical components near the evaporator coil, which requires disassembly of the unit. Unless you have experience with appliance electrical diagnostics, professional service is the recommended approach.
Is it safe to keep running my Kenmore air conditioner with the ES error showing?
You should not continue running the unit while the ES code is active. The evaporator coil sensor is what prevents the coil from icing over and protects the compressor from operating under unsafe thermal conditions. Running the unit without a functioning sensor risks coil icing, reduced airflow, and potential compressor damage. Turn the unit off and contact a technician.
Will resetting my Kenmore air conditioner clear the ES error code?
A power reset by unplugging the unit for a few minutes may temporarily clear the code if the fault was caused by a one-time signal glitch, but it will return if the sensor or its wiring has actually failed. The ES code indicates a hardware problem that a reset cannot fix. If the code reappears after a reset, the sensor or a related component needs to be inspected and replaced.
How much does it cost to repair the ES error on a Kenmore air conditioner?
Repair costs depend on the specific failed component and whether the unit is under warranty. A thermistor sensor replacement is generally among the lower-cost repairs, typically ranging from around $75 to $200 including parts and labor. If the control board is the cause, costs can be higher, often in the $150 to $350 range. Contact 1-800-4-MY-HOME (1-800-469-4663) for a service estimate specific to your model.

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