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Error code reference

Frigidaire Air Conditioner Error Code ES

Evaporator thermistor sensor has failed.

Frigidaire codesFrigidaire air conditioner codes
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What the ES error code actually means

The ES error means your air conditioner's internal temperature sensors are not working correctly, so the unit cannot accurately read the temperature and has shut down to protect itself. These sensors are what tell the air conditioner how hard to work and when to cool, so without them functioning properly, the system refuses to operate. You will likely need a technician to test and replace the faulty sensor before the unit will run again.

Diagnostic procedure

The full ES procedure

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First diagnostic step
Check/replace the evaporator thermistor.
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Most common causes of ES

Ranked by how often they cause this code
  1. 1Failed thermistor (temperature sensor)
  2. 2Damaged or disconnected sensor wiring harness
  3. 3Moisture or corrosion at the sensor connector
  4. 4Control board sensor input circuit failure

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Questions people ask about ES

What does the ES error code mean on a Frigidaire air conditioner?
ES means the control board has detected a sensor failure. The sensor involved is typically a thermistor, a small component that measures temperature and sends that data to the control board. When the sensor fails or its circuit is broken, the board displays ES and interrupts normal operation because it can no longer regulate the cooling cycle accurately.
How do I fix the ES error code on my Frigidaire air conditioner?
Frigidaire's specified first step is to contact an Authorized Frigidaire Service Center. A technician will use a multimeter to test the thermistor's resistance against the manufacturer's spec, inspect the wiring harness for damage or corrosion, and confirm whether the fault is in the sensor, its wiring, or the control board's input circuit. This is not a repair that can be resolved by resetting the unit alone.
Will resetting my Frigidaire air conditioner clear the ES code?
A power reset may temporarily clear the display, but if the sensor or its wiring has physically failed, the ES code will return as soon as the unit restarts and the control board runs its sensor check. A reset does not fix the underlying hardware fault. If the code comes back after a reset, the unit needs professional diagnosis.
Can I still use my Frigidaire air conditioner when ES is showing?
Running the unit while ES is active is not recommended. Without a functioning temperature sensor, the control board cannot monitor conditions accurately, which means the compressor and fan may not cycle correctly. Continued operation could lead to inadequate cooling, potential overheating of internal components, or compressor damage. Power the unit off and schedule a service call.
How much does it cost to repair the ES error code on a Frigidaire air conditioner?
If the fix is a thermistor replacement, parts are typically inexpensive, often under thirty dollars, but labor and a service call fee will make up most of the cost. If the control board needs replacement, expect higher parts costs depending on the model. Getting a diagnosis from an Authorized Frigidaire Service Center first will clarify which component has failed before committing to a repair cost.

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