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Error code reference

Samsung Air Conditioner Error Code E263

Fixed compressor 2 discharge temperature sensor breakaway

Samsung codesSamsung air conditioner codes

Fixed compressor 2 discharge temperature sensor breakaway - difference between digital compressor discharge temp and fixed compressor 2 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 E263 means on a Samsung air conditioner

The E263 error code on a Samsung air conditioner indicates a breakaway condition for the fixed compressor 2 discharge temperature sensor. Specifically, the control board has detected that the temperature difference between the digital compressor discharge sensor reading and the fixed compressor 2 discharge sensor reading exceeds 40 degrees Celsius. This differential threshold is used by the system to identify when a sensor has physically separated from its mounting point on the discharge line, because a detached sensor will read ambient cabinet temperatures rather than the actual refrigerant discharge temperature, producing an abnormally large gap between the two sensor values.

This fault is specific to multi-compressor systems where both a digital (variable speed) compressor and one or more fixed-speed compressors operate together. The discharge temperature sensor for the fixed compressor 2 is typically a thermistor clipped or strapped directly to the discharge refrigerant line at the compressor outlet. If this sensor loses contact with the pipe, its resistance output will shift dramatically, causing the control board to calculate an implausible temperature differential and trigger the E263 fault.

The primary diagnostic focus should be physical inspection of the sensor mounting. A separated sensor is the most likely cause and the easiest to resolve. If the sensor is still properly seated and the fault persists, the thermistor itself may be damaged or out of calibration, requiring resistance testing against the temperature-resistance curve specified for that component. Wiring integrity between the sensor and the main control board should also be checked for loose connectors, corrosion, or conductor damage.

Source: manufacturer service documentation.

Common causes of E263

  1. 01

    Sensor physically separated from discharge line

    Wiring / connection

    The fixed compressor 2 discharge thermistor has come unclipped or unwrapped from its mounting on the discharge pipe. This is the most common cause and is confirmed by visually locating the sensor hanging free or resting away from the pipe surface.

  2. 02

    Loose or corroded wiring connector

    Wiring / connection

    The connector between the discharge temperature sensor and the control board may be partially unseated or corroded, causing erratic or offset resistance readings that simulate a detached sensor. Inspect the harness connector at both the sensor end and the board end for proper seating and corrosion.

  3. 03

    Faulty or out-of-range thermistor

    Part replacement

    The thermistor element inside the sensor may have failed or drifted out of its specified resistance range, causing the control board to read an implausible temperature. Testing the sensor resistance and comparing it to the expected value at a known ambient temperature will confirm this failure.

  4. 04

    Damaged sensor wiring

    Part replacement

    Physical damage to the sensor wire, such as chafing against a sharp edge or pinching from a cabinet panel, can cause intermittent open-circuit or short-circuit conditions that produce false temperature readings and trigger the differential fault.

  5. 05

    Control board input circuit fault

    Part replacement

    If the sensor and wiring both test correctly, the thermistor input circuit on the main control board may have failed, preventing accurate signal processing. This is the least common cause and should only be considered after all sensor and wiring checks are completed.

See the test procedure for each cause

Frequently asked questions about E263

What does E263 mean on a Samsung air conditioner?
E263 indicates that the fixed compressor 2 discharge temperature sensor has separated or lost proper contact with the discharge line. The system detects this because the temperature reading from that sensor differs from the digital compressor discharge sensor reading by more than 40 degrees Celsius. This differential is large enough that the control board treats it as a sensor fault rather than a normal operating condition.
Can I fix the E263 error myself, or do I need a technician?
If the sensor has simply come loose from its mounting on the discharge pipe, a knowledgeable DIYer can reattach and secure it, which is the first recommended diagnostic step. However, accessing the compressor section of a commercial or multi-split Samsung unit typically requires removing panels and working near refrigerant lines, so comfort with HVAC equipment is important. If the sensor or wiring needs replacement, or if the fault persists after reseating the sensor, a certified technician should be called.
Is it safe to keep running my air conditioner with an E263 error?
Operating the system with an active E263 fault is not recommended. The control board cannot accurately monitor compressor 2 discharge temperature, which means it cannot protect that compressor from overheating conditions. Continued operation without proper temperature monitoring risks compressor damage, which is a significantly more expensive repair than addressing the sensor issue.
Will resetting the unit clear the E263 error code?
A power reset may temporarily clear the displayed fault, but the E263 code will return as soon as the system detects the temperature differential again during operation. The underlying cause, most often a physically separated sensor, must be corrected before the fault will clear permanently. Always address the root cause rather than relying on resets.
How much does it cost to repair an E263 error on a Samsung air conditioner?
If the repair is simply reseating a detached sensor, labor costs may range from around $75 to $150 depending on the technician and access difficulty. If the sensor thermistor requires replacement, parts typically add $20 to $80 to that cost. A control board replacement, which is the least likely scenario, can range from $200 to $600 or more for parts and labor combined.

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