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Error code reference

Kenmore Air Conditioner Error Code AS

Air temperature sensor has failed.

Kenmore codesKenmore air conditioner codes

Air temperature 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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What AS means on a Kenmore air conditioner

The AS error code on a Kenmore air conditioner indicates that the air temperature sensor has failed. This sensor, typically a negative temperature coefficient (NTC) thermistor, is responsible for monitoring the ambient or return air temperature entering the unit. The control board uses this reading to regulate cooling cycles, fan speed, and compressor operation. When the sensor falls outside its expected resistance range or sends no signal at all, the board flags the AS fault and may shut down normal operation to prevent incorrect temperature management.

The air temperature sensor is a small, low-cost component, but its failure can cascade into broader comfort and efficiency problems. A failed sensor can cause the unit to run continuously, short-cycle, or refuse to cool altogether because the control board cannot accurately determine whether the target temperature has been reached. The fault can result from physical damage to the sensor, corrosion on its connector terminals, or degradation of the thermistor element itself over time.

Because diagnosing a thermistor fault requires measuring resistance values and checking wiring continuity, this repair is best handled by a qualified technician. Kenmore recommends contacting their support line at 1-800-4-MY-HOME (1-800-469-4663) to arrange a service appointment. A technician can confirm whether the sensor, its wiring harness, or the control board itself is at fault before any parts are ordered.

Source: manufacturer service documentation.

Common causes of AS

  1. 01

    Failed thermistor element

    Part replacement

    The thermistor itself degrades over time and can fall outside its rated resistance range, causing the control board to read an open or shorted circuit. This is the most common root cause of the AS code.

  2. 02

    Corroded or loose connector terminals

    Wiring / connection

    Moisture inside the unit can corrode the connector pins that attach the sensor to the wiring harness, creating an intermittent or complete loss of signal. Inspect the connector for green or white oxidation and loose fit.

  3. 03

    Damaged sensor wiring

    Part replacement

    The wiring between the sensor and the control board can fray, pinch, or break due to vibration or improper installation. A continuity check along the harness will identify any open sections.

  4. 04

    Control board fault

    Part replacement

    If the sensor and its wiring test within normal parameters, the control board's sensor input circuit may have failed, causing it to misread or ignore the sensor signal entirely.

See the test procedure for each cause

Frequently asked questions about AS

What does AS mean on a Kenmore air_conditioner?
The AS code means the air temperature sensor has failed or is sending a signal outside the acceptable range. This sensor monitors the air temperature entering the unit so the control board can manage cooling cycles properly. When it fails, the unit may stop cooling correctly or shut down. Contact Kenmore at 1-800-4-MY-HOME (1-800-469-4663) to arrange a service visit.
Can I fix the AS error code myself?
Diagnosing this fault accurately requires measuring thermistor resistance and checking wiring continuity, which goes beyond basic homeowner maintenance. While a knowledgeable DIYer might inspect the sensor connector for visible corrosion or loose connections, replacing the sensor or control board typically requires a trained technician. Kenmore recommends calling 1-800-469-4663 for professional repair.
Is it safe to keep running my Kenmore AC while the AS code is showing?
Running the unit with an active AS fault is not recommended. Without accurate temperature data, the control board cannot regulate the compressor and fan correctly, which could lead to the unit running continuously or not at all. Continued operation in this state may put additional strain on the compressor. It is best to turn the unit off and schedule a repair.
Will resetting the air conditioner clear the AS error code?
A power reset may temporarily clear the code, but if the underlying sensor fault remains, the AS error will return once the unit restarts and checks the sensor input again. A reset does not repair a failed thermistor or damaged wiring. Professional diagnosis is needed to resolve the fault permanently.
How much does it cost to repair the AS error on a Kenmore air conditioner?
Repair costs vary depending on whether the sensor, wiring harness, or control board needs replacement, plus the cost of a service call. Sensor replacements are generally the least expensive option, typically ranging from a modest parts cost plus labor, while a control board replacement can run significantly higher. Contact Kenmore support or a local authorized technician for a specific estimate based on your model.

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