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Error code reference

Samsung Air Conditioner Error Code E323

Error on suction sensor 2 (Short or Open).

Samsung codesSamsung air conditioner codes

Error on suction sensor 2 (Short or Open).

First step from the service manual

Check if connector broke away from PCB.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
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What E323 means on a Samsung air conditioner

Error code E323 on a Samsung air conditioner indicates a fault detected on suction sensor 2, specifically either a short circuit or an open circuit condition in the sensor or its wiring circuit. Suction sensors monitor refrigerant temperature at the suction line entering the compressor, and this data is used by the PCB to regulate system operation, prevent compressor flooding, and optimize efficiency. When the PCB reads a resistance value outside the expected range for the sensor, it cannot trust the temperature data and triggers E323 to halt or restrict operation.

A short circuit condition occurs when the sensor's resistance drops far below the normal operating range, often caused by damaged insulation allowing wiring to contact a ground or each other. An open circuit condition occurs when the resistance reads excessively high or infinite, indicating a broken wire, corroded terminal, or failed sensor element. Both conditions produce readings the PCB interprets as physically impossible temperatures, which is how it distinguishes sensor faults from actual refrigerant temperature anomalies.

The first diagnostic step is to inspect the sensor connector at the PCB, as a connector that has separated or backed out of its socket will immediately produce an open circuit reading. Beyond the connector, technicians should inspect the full wiring harness from the PCB to the sensor location on the suction line, check for pinched or chafed wiring, and test the sensor's resistance with a multimeter to determine whether the sensor element itself has failed.

Source: manufacturer service documentation.

Common causes of E323

  1. 01

    Disconnected or loose sensor connector at PCB

    Wiring / connection

    The connector for suction sensor 2 may have backed out of or broken away from the PCB socket, causing an immediate open circuit. Inspect the connector seating and any locking tabs before proceeding to other diagnostics.

  2. 02

    Failed suction sensor 2 element

    Part replacement

    The thermistor element inside the sensor can fail internally, producing either a near-zero resistance (short) or infinite resistance (open). Measure the sensor's resistance with a multimeter and compare it to the expected value for the current ambient temperature to confirm failure.

  3. 03

    Damaged wiring harness between sensor and PCB

    Part replacement

    Wiring routed near sharp edges, moving components, or heat sources can develop breaks or shorts in insulation over time. Visually inspect the full harness length and use a multimeter to perform a continuity check on each wire.

  4. 04

    Corroded or oxidized sensor connector terminals

    Wiring / connection

    Moisture intrusion into the connector housing can cause terminal corrosion that increases resistance enough to simulate an open circuit. Inspect terminals for green or white oxidation and clean or replace the connector as needed.

  5. 05

    Faulty PCB sensor input circuit

    Part replacement

    If the sensor and wiring both test within normal parameters, the PCB input circuit responsible for reading suction sensor 2 may have failed. This is the least common cause and should only be considered after all other components are confirmed good.

See the test procedure for each cause

Frequently asked questions about E323

What does E323 mean on a Samsung air conditioner?
E323 indicates a short circuit or open circuit fault on suction sensor 2, a temperature sensor that monitors the refrigerant suction line. The PCB detected a resistance reading outside the acceptable range, which prevents it from obtaining valid temperature data. The system may shut down or restrict operation to protect the compressor until the fault is resolved.
Can I fix E323 on my Samsung air conditioner myself?
Some causes of E323 are accessible to a knowledgeable DIYer, such as reseating a loose connector at the PCB or inspecting visible wiring for damage. However, working near refrigerant lines, testing sensor resistance accurately, or replacing PCB components typically requires technical experience. If basic connector checks do not resolve the fault, a qualified technician should perform further diagnostics.
Is it safe to keep running my Samsung air conditioner with error E323?
Operating the unit while E323 is active is not recommended. Suction sensor 2 provides temperature data the PCB uses to protect the compressor from overheating or refrigerant flooding. Running the system without reliable sensor input risks compressor damage, which is a significantly more expensive repair than addressing the sensor fault.
How much does it cost to repair a Samsung air conditioner E323 error?
Repair costs vary depending on the root cause. A simple connector reseating involves no parts cost and minimal labor time. Replacing a faulty suction sensor typically falls in the range of $50 to $150 for parts and labor. If the PCB requires replacement, costs can range from $200 to $600 or more depending on the unit model and service rates in your area.
Will resetting my Samsung air conditioner clear the E323 error?
A power reset may temporarily clear the E323 code, but if the underlying sensor circuit fault still exists, the error will return once the unit restarts and attempts to read suction sensor 2. A reset alone is not a fix. The sensor connector, wiring, and sensor element must be inspected and tested to permanently resolve the fault.

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