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Error code reference

Samsung Air Conditioner Error Code E305

COND-MID sensor breakaway of outdoor unit.

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COND-MID sensor breakaway of outdoor unit.

First step from the service manual

Check if COND MID sensor is separated; reassemble.

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

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What E305 means on a Samsung air conditioner

Error code E305 on a Samsung air conditioner indicates a COND-MID sensor breakaway condition on the outdoor unit. The COND-MID sensor, short for condenser midpoint temperature sensor, monitors the temperature at an intermediate point along the outdoor condenser coil. This reading is used by the system's control board to regulate refrigerant flow, compressor operation, and fan speed in real time. When the sensor physically separates from its mounting position or loses contact with the coil surface, the control board can no longer receive a valid temperature signal and triggers E305.

The most common cause of this fault is physical disconnection of the sensor from the coil or its wiring harness. Sensors are typically held in place with clips or brackets, and vibration over time, thermal expansion and contraction cycles, or accidental contact during maintenance can cause them to pull free. The sensor itself may still be electrically functional, but its physical separation from the measurement point renders its readings inaccurate or absent, prompting the error.

Diagnosing E305 begins with a visual inspection of the condenser midpoint sensor inside the outdoor unit cabinet. The technician should confirm whether the sensor probe has detached from the coil bracket or clip and check the wiring harness for any loose connectors or visible damage. If the sensor is simply displaced, reseating it in its original mounting position and confirming a secure connection to the harness is often sufficient to clear the fault. If the sensor or connector shows damage, replacement will be required.

Source: manufacturer service documentation.

Common causes of E305

  1. 01

    Sensor physically displaced from mounting clip

    Wiring / connection

    The COND-MID sensor probe has pulled out of or fallen from its retaining clip on the condenser coil. This is the most direct cause of E305 and is confirmed by visually locating the sensor hanging loose or resting out of position inside the outdoor unit.

  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 come unseated due to vibration or handling. Inspecting the harness connection at both the sensor end and the board end will reveal whether the plug needs to be firmly reseated.

  3. 03

    Damaged sensor bracket or retaining clip

    Part replacement

    The clip or bracket that holds the sensor against the condenser coil can crack or deform over time, especially under repeated thermal cycling. If the mounting hardware is broken, the sensor cannot be reliably held in place and the bracket or clip will need replacement.

  4. 04

    Damaged sensor probe or wiring

    Part replacement

    Physical damage to the sensor body or its lead wires, such as kinking, corrosion, or cuts from contact with coil fins, can cause intermittent or absent signals. If the sensor or wiring shows visible damage, the sensor assembly should be replaced.

  5. 05

    Disturbance during prior maintenance

    Wiring / connection

    Cleaning, coil servicing, or any prior work performed inside the outdoor unit cabinet can inadvertently dislodge the sensor from its mounting point. If E305 appears shortly after a service visit, the sensor position should be checked first.

See the test procedure for each cause

Frequently asked questions about E305

What does E305 mean on a Samsung air conditioner?
E305 indicates that the condenser midpoint temperature sensor on the outdoor unit has separated or become displaced from its mounting position. This sensor monitors temperature along the condenser coil, and when it detaches, the control board can no longer trust its readings. The system triggers E305 as a protective measure and stops normal operation until the sensor is repositioned and secured.
How do I fix the E305 error on my Samsung air conditioner?
The first step is to power down the unit and inspect the outdoor unit cabinet for the COND-MID sensor, which should be clipped or bracketed to the condenser coil at a midpoint location. If it has come loose, reseat it firmly in its clip and confirm the wiring harness connector is fully plugged in. If the sensor, clip, or wiring is damaged, those components will need to be replaced before the error will clear.
Is it safe to run my Samsung air conditioner while E305 is active?
It is not recommended to continue operating the unit with E305 active. The condenser midpoint sensor provides data the control board uses to manage compressor and fan operation safely. Running the system without a reliable reading from this sensor could lead to improper refrigerant management or stress on the compressor over time.
Will resetting the unit clear the E305 error?
A simple power reset will not permanently clear E305 if the underlying sensor displacement has not been corrected. The error will return as soon as the control board checks the sensor signal again. The sensor must be physically reseated and confirmed secure before the fault will stay cleared after a reset.
How much does it cost to repair a Samsung air conditioner E305 error?
If the sensor has simply come loose and only needs to be reseated, repair costs are typically limited to a service call fee, which generally ranges from around 75 to 150 dollars depending on the technician and region. If the sensor itself or its mounting hardware is damaged and needs replacement, parts and labor combined can range from approximately 100 to 300 dollars, depending on part availability and local labor rates.

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