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Error code reference

Samsung Air Conditioner Error Code G3

Breakaway of COND MID sensor in outdoor unit.

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Breakaway of COND MID sensor in outdoor unit.

First step from the service manual

Check breakaway of outdoor unit COND OUT sensor and reassemble to correct.

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What G3 means on a Samsung air conditioner

The G3 error code on a Samsung air conditioner indicates a breakaway (disconnection or open circuit) of the COND MID sensor located in the outdoor unit. This sensor monitors the midpoint temperature of the condenser coil, providing the control board with real-time thermal data used to regulate compressor operation, fan speed, and refrigerant flow. When the sensor signal is lost or falls outside the expected range, the system triggers G3 and may limit or halt operation to prevent damage from unmonitored heat conditions.

The COND MID sensor is a thermistor-type component that changes resistance in response to temperature changes. A breakaway condition typically refers to the sensor physically pulling free from its mounting clip or connector on the condenser coil, causing an open circuit. This can happen due to vibration over time, improper handling during prior service, or a failed connector. The control board interprets the missing signal as a fault and registers the G3 code.

Diagnosing this fault begins with a physical inspection of the outdoor unit condenser coil area. The sensor should be reseated firmly into its clip and the wiring harness connector verified as fully engaged. If reconnecting the sensor clears the error and normal readings return, no parts replacement may be needed. If the sensor itself has a damaged lead wire or a failed thermistor element, replacement is required to restore accurate condenser midpoint temperature monitoring.

Source: manufacturer service documentation.

Common causes of G3

  1. 01

    Sensor physically dislodged from mounting clip

    Wiring / connection

    The COND MID sensor may have vibrated loose from its clip on the condenser coil. Reseating the sensor firmly into its original mounting position is the first corrective step.

  2. 02

    Loose or disconnected wiring harness connector

    Wiring / connection

    The connector linking the COND MID sensor to the outdoor unit control board may have worked loose. Inspecting and firmly reseating the connector can restore the signal without replacing the sensor.

  3. 03

    Damaged sensor lead wire

    Part replacement

    The wire running from the sensor to the connector may be frayed, kinked, or broken, resulting in an open circuit. Inspect the full length of the wire for visible damage and continuity.

  4. 04

    Failed thermistor element in the sensor

    Part replacement

    The thermistor inside the COND MID sensor may have failed internally, producing no signal even when physically connected. A resistance check of the sensor element will confirm this fault.

  5. 05

    Outdoor control board fault

    Part replacement

    In rare cases, the outdoor unit control board may fail to read the sensor signal correctly even when the sensor and wiring are intact. This is typically ruled out only after confirming the sensor and harness are good.

See the test procedure for each cause

Frequently asked questions about G3

What does G3 mean on a Samsung air conditioner?
G3 indicates a breakaway condition of the COND MID sensor in the outdoor unit. This means the sensor has disconnected or lost signal, preventing the system from monitoring condenser midpoint temperature. The unit may shut down or restrict operation until the fault is resolved.
Can I fix the G3 error myself without calling a technician?
If the sensor has simply come loose from its mounting clip or the wiring connector is unplugged, reseating it is a straightforward fix that a knowledgeable DIYer can perform. However, working inside the outdoor unit involves electrical components, so the unit should be powered off at the breaker before inspection. If the sensor or wiring is damaged, replacement is needed and a technician may be advisable.
Is it safe to keep running my air conditioner with a G3 error?
Operating the system with a G3 fault is not recommended. The COND MID sensor provides critical thermal data for the condenser coil, and running without it means the control board cannot properly monitor heat levels. This could lead to compressor stress or further component damage over time.
How much does it cost to repair a G3 error on a Samsung air conditioner?
If only the sensor needs to be reseated, the repair may cost nothing beyond a service call fee, which typically ranges from $50 to $100. If the COND MID sensor itself requires replacement, parts and labor costs generally range from $75 to $250 depending on the model and local labor rates. Control board replacement, if needed, will cost significantly more.
Will resetting the air conditioner clear the G3 error code?
A reset may temporarily clear the G3 code, but if the underlying sensor disconnection or fault has not been corrected, the error will return once the system attempts to read the sensor again. The root cause must be addressed by inspecting and reseating or replacing the COND MID sensor before the error will stay cleared.

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