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Error code reference

Samsung Air Conditioner Error Code E264

Fixed compressor 3 discharge temperature sensor breakaway

Samsung codesSamsung air conditioner codes

Fixed compressor 3 discharge temperature sensor breakaway - difference between digital compressor discharge temp and fixed compressor 3 discharge temp exceeds 40°C.

First step from the service manual

Check if the corresponding compressor discharge temperature sensor is separated; reassemble and adjust.

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

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What E264 means on a Samsung air conditioner

Samsung E264 is a discharge temperature sensor differential fault specific to multi-compressor air conditioning systems. The error triggers when the temperature reading from the fixed compressor 3 discharge sensor deviates from the digital compressor discharge temperature reading by more than 40 degrees Celsius. This threshold exists because both compressors operate within the same refrigerant circuit under similar load conditions, so a large divergence between their discharge temperatures indicates a sensor problem rather than a genuine thermal difference between the two units.

The most common root cause is physical separation of the fixed compressor 3 discharge temperature sensor from its mounting point on the compressor discharge line. These sensors are typically clamped or clipped directly onto the discharge pipe, and vibration from normal compressor operation can gradually loosen the connection over time. When the sensor loses contact with the pipe surface, it begins reading ambient air temperature instead of the actual discharge temperature, creating an artificially low reading that diverges sharply from the digital compressor sensor still in proper contact.

Diagnosing E264 begins with a physical inspection of the fixed compressor 3 discharge temperature sensor to confirm it is seated correctly against the discharge line and that any retaining clip or clamp is secure. If the sensor has separated, reassembling and firmly securing it to the pipe will often resolve the fault immediately once the system is restarted. If the sensor is properly positioned but the fault persists, the sensor itself or its wiring harness may be damaged, requiring resistance testing to confirm proper function before replacement.

Source: manufacturer service documentation.

Common causes of E264

  1. 01

    Discharge sensor physically separated from pipe

    Wiring / connection

    The fixed compressor 3 discharge temperature sensor has detached from its mounting position on the discharge line, causing it to read ambient air temperature instead of actual discharge temperature. Inspect the sensor mounting clip or clamp for looseness and reseat the sensor firmly against the pipe.

  2. 02

    Loose or damaged sensor retaining clip

    Part replacement

    The clamp or retaining clip that holds the sensor against the discharge pipe has weakened or broken due to compressor vibration, allowing the sensor to drift away from the pipe surface. A replacement clip or clamp may be needed to secure the sensor properly.

  3. 03

    Faulty discharge temperature sensor

    Part replacement

    The fixed compressor 3 discharge temperature sensor itself may have failed internally, producing an out-of-range resistance value even when physically positioned correctly. Resistance testing of the sensor across its terminals will confirm whether it falls within the expected specification for its ambient temperature.

  4. 04

    Damaged wiring harness or connector

    Part replacement

    The wiring between the fixed compressor 3 discharge sensor and the control board may have chafed, corroded, or developed a poor connection at the connector, resulting in an erroneous temperature signal. Inspect the harness routing near the compressor for heat damage, pinching, or corrosion at the connector pins.

  5. 05

    Control board input fault

    Part replacement

    In rare cases, the control board circuit responsible for reading the fixed compressor 3 discharge sensor input may be faulty, misreading the signal even when the sensor and wiring are intact. This should only be suspected after confirming the sensor and wiring test correctly.

See the test procedure for each cause

Frequently asked questions about E264

What does E264 mean on a Samsung air conditioner?
E264 indicates that the discharge temperature reading from fixed compressor 3 differs from the digital compressor discharge temperature by more than 40 degrees Celsius. Samsung systems monitor this differential to detect sensor problems in multi-compressor configurations. The fault most commonly occurs when the fixed compressor 3 discharge temperature sensor has physically separated from its mounting on the discharge pipe. The system flags this condition to prevent operating on unreliable temperature data.
How do I fix error code E264 on my Samsung air conditioner?
Start by locating the fixed compressor 3 discharge temperature sensor on the discharge line and checking whether it has come loose from its mounting clip or clamp. If it has separated, reseat it firmly against the pipe and secure the retaining hardware, then restart the unit to see if the fault clears. If the sensor is properly positioned and the error persists, test the sensor resistance and inspect the wiring harness for damage before considering sensor or board replacement.
Is it safe to keep running my air conditioner with error code E264 active?
Continuing to operate the system while E264 is active is not recommended. The fault means the control system cannot accurately monitor fixed compressor 3 discharge temperatures, which could allow the compressor to operate outside safe thermal limits without triggering protective shutdowns. Addressing the fault promptly reduces the risk of compressor damage.
Will resetting my Samsung air conditioner clear the E264 error?
A power reset may temporarily clear the E264 code, but it will return quickly if the underlying problem has not been corrected. Because the fault is triggered by an ongoing temperature differential between two sensors, the system will detect the discrepancy again as soon as both compressors are running. The physical sensor connection or sensor condition must be corrected for the fault to clear permanently.
How much does it cost to repair a Samsung air conditioner showing E264?
If the repair only involves reseating a separated sensor, the cost is typically limited to a diagnostic service call, which generally ranges from $75 to $150 depending on your location and the service provider. If the sensor itself needs replacement, parts and labor combined typically range from $150 to $350. Control board replacement, if required, can push total costs into the $400 to $700 range or higher for commercial multi-compressor systems.

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