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Error code reference

Samsung Air Conditioner Error Code E310

Fixed capacity compressor 3 discharge sensor error OPEN/SHORT

Samsung codesSamsung air conditioner codes

Fixed capacity compressor 3 discharge sensor error OPEN/SHORT - detected when outdoor temp over -10°C, error level over 4.95V (-30°C) / below 0.5V (151°C).

First step from the service manual

Check if sensor connector is separated from PCB; measure resistance.

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

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What E310 means on a Samsung air conditioner

Error code E310 on a Samsung air conditioner indicates a fault in the discharge temperature sensor for the fixed capacity compressor 3. This sensor monitors the refrigerant temperature at the compressor discharge port, which is a critical measurement for protecting the compressor from overheating and ensuring safe system operation. The error is classified as either an OPEN or SHORT circuit condition and is only flagged when the outdoor ambient temperature is above -10°C, which prevents false positives in extreme cold conditions.

The control logic triggers E310 when the sensor signal voltage rises above 4.95V or falls below 0.5V. A reading above 4.95V corresponds to an open circuit condition, equivalent to a temperature reading below -30°C, which is physically implausible during normal operation. A reading below 0.5V corresponds to a short circuit condition, equivalent to a temperature reading above 151°C. Both extremes indicate the PCB is receiving an invalid signal rather than a real temperature measurement.

The most common starting point for diagnosis is inspecting the sensor connector at the outdoor unit PCB. A disconnected, corroded, or damaged connector can immediately cause a voltage out of range condition. If the connector is secure, the next step is measuring the sensor resistance and comparing it to the expected value at a known ambient temperature. A sensor that reads open or near-zero resistance confirms it has failed internally and must be replaced.

Source: manufacturer service documentation.

Common causes of E310

  1. 01

    Disconnected sensor connector at PCB

    Wiring / connection

    The connector linking the discharge sensor to the outdoor unit PCB may have come loose due to vibration or improper handling. Inspect the connector seating and look for any visible separation or bent pins.

  2. 02

    Failed discharge temperature sensor

    Part replacement

    The sensor itself may have failed open or short internally, producing a voltage outside the 0.5V to 4.95V valid range. Measure sensor resistance at a known temperature to confirm whether the sensor is out of specification.

  3. 03

    Damaged sensor wiring or harness

    Part replacement

    Wiring between the sensor and the PCB can become pinched, chafed, or broken, especially near mounting brackets or moving components. Inspect the full wire harness for visible damage and test continuity.

  4. 04

    Corroded or contaminated connector

    Wiring / connection

    Moisture intrusion into the outdoor unit can cause connector pin corrosion, increasing resistance and pushing the signal voltage out of range. Clean corroded connectors carefully and reseat them; replace if corrosion is severe.

  5. 05

    Faulty outdoor unit PCB

    Part replacement

    If the sensor and wiring both test correctly, the PCB input circuit for the sensor signal may be damaged. This is the least common cause and should only be considered after sensor and wiring are confirmed good.

See the test procedure for each cause

Frequently asked questions about E310

What does E310 mean on a Samsung air conditioner?
E310 indicates a discharge temperature sensor error on the fixed capacity compressor 3 in the outdoor unit. The control board has detected a signal voltage either above 4.95V (open circuit) or below 0.5V (short circuit), both of which fall outside the valid sensor range. This error is only triggered when outdoor temperatures are above -10°C to avoid false readings in very cold conditions. The system shuts down or restricts operation to prevent compressor damage.
Can I fix E310 on my Samsung air conditioner myself?
A knowledgeable DIYer can inspect and reseat the sensor connector at the outdoor PCB, which is the first recommended step and requires no special tools. Measuring sensor resistance requires a multimeter and some familiarity with temperature-resistance relationships. Replacing the discharge sensor or PCB involves working inside the outdoor unit and may require handling refrigerant lines, so those steps are best handled by a qualified technician.
Is it safe to keep running my air conditioner with error E310?
No, it is not recommended to continue operating the system with E310 active. The discharge sensor is a protective device that guards the compressor against overheating. Without a valid sensor reading, the control board cannot detect a potentially dangerous compressor temperature condition. Continued operation could result in compressor damage, which is a costly repair.
Will resetting the unit clear the E310 error?
A power reset may temporarily clear the error code, but E310 will return if the underlying sensor fault is still present. Because the error is triggered by a measurable out-of-range voltage condition, it will reappear as soon as the unit attempts to operate and reads the invalid sensor signal. The root cause, whether a loose connector, damaged wiring, or failed sensor, must be corrected for the error to stay cleared.
How much does it cost to repair a Samsung air conditioner E310 error?
If the fix is simply reseating a disconnected connector, the cost may be limited to a service call fee, typically in the range of $75 to $150. Replacing the discharge temperature sensor itself is generally a lower-cost part repair, often falling in the $100 to $250 range including labor. If the outdoor unit PCB is at fault, parts and labor costs can range from $300 to $600 or more depending on the model and technician rates.

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