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Error code reference

Samsung Air Conditioner Error Code E237

Suction temperature sensor breakaway

Samsung codesSamsung air conditioner codes

Suction temperature sensor breakaway - absolute difference between initial and current suction temperature is less than 2°C for 30 minutes.

First step from the service manual

Check if the suction sensor and sensor holder are correctly attached.

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
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What E237 means on a Samsung air conditioner

Error code E237 on a Samsung air conditioner indicates a suction temperature sensor breakaway condition. Specifically, the system's control board monitors the absolute difference between the suction line temperature recorded at startup and the current reading during operation. When that difference remains less than 2 degrees Celsius for a continuous period of 30 minutes, the unit flags E237. This behavior suggests the suction temperature sensor is not responding to actual refrigerant temperature changes as expected during a normal operating cycle.

The suction temperature sensor is positioned on the suction line to monitor the temperature of refrigerant gas returning from the indoor unit to the compressor. During normal operation, this temperature should fluctuate as the system cycles and load conditions change. A reading that remains nearly static for 30 minutes typically points to a sensor that has lost proper thermal contact with the suction line rather than an outright sensor failure. The sensor may have slipped out of its holder, become loose, or detached entirely, causing it to read ambient air temperature instead of refrigerant line temperature.

The most immediate diagnostic step is to inspect the suction sensor and its mounting holder to confirm both are correctly seated and making firm contact with the suction pipe. If the sensor and holder are properly attached, the next step is to test the sensor's resistance output across its operating temperature range and compare those readings to the specified values for that sensor. A sensor producing a stable but inaccurate resistance value may indicate internal failure, requiring replacement.

Source: manufacturer service documentation.

Common causes of E237

  1. 01

    Sensor or sensor holder detached from suction line

    Wiring / connection

    The suction temperature sensor may have slipped out of its holder or the holder itself may have separated from the suction pipe. This is the most common cause and will result in the sensor reading relatively stable ambient air temperature instead of the changing refrigerant temperature.

  2. 02

    Sensor holder improperly seated

    Wiring / connection

    Even if the sensor is inserted into its holder, the holder may not be making full contact with the suction pipe. Poor contact reduces heat transfer to the sensor, preventing it from detecting the expected temperature variation.

  3. 03

    Damaged or pinched sensor wiring

    Part replacement

    If the sensor wiring harness is pinched, partially broken, or has a damaged connector, the sensor signal reaching the control board may be artificially stable. Inspect the wiring from the sensor to the board for visible damage or loose pin connections.

  4. 04

    Faulty suction temperature sensor

    Part replacement

    The sensor itself may have failed internally, producing a fixed or out-of-range resistance reading regardless of actual line temperature. Testing the sensor resistance across its temperature range will confirm whether it is defective and needs replacement.

  5. 05

    Refrigerant flow issue causing abnormally stable suction temperature

    Wiring / connection

    In some cases, severely restricted refrigerant flow or a low charge condition can result in very little temperature variation at the suction line, causing the system to interpret normal sensor output as a breakaway fault. This would typically be accompanied by other performance complaints.

See the test procedure for each cause

Frequently asked questions about E237

What does E237 mean on a Samsung air conditioner?
E237 indicates a suction temperature sensor breakaway fault. The system detected that the difference between the suction line temperature at startup and the current reading stayed below 2 degrees Celsius for 30 consecutive minutes. This typically means the sensor has lost contact with the suction pipe and is not accurately tracking refrigerant temperature changes.
How do I fix error E237 on my Samsung air conditioner?
Start by checking whether the suction temperature sensor and its holder are securely attached to the suction line. If the sensor has come loose, reseating it in the holder and confirming firm contact with the pipe may resolve the error. If the sensor and holder are properly positioned and the fault persists, the sensor wiring and sensor resistance values should be tested to determine whether replacement is needed.
Will resetting my Samsung air conditioner clear the E237 error?
A power reset may temporarily clear the fault code, but E237 will return if the underlying cause is not corrected. If the suction sensor is still detached or faulty after the reset, the unit will detect the same abnormal temperature pattern within 30 minutes of operation and trigger the code again. The physical issue must be addressed for the error to clear permanently.
Is it safe to keep running my Samsung air conditioner with an E237 error?
Running the unit continuously with E237 active is not recommended. The suction temperature sensor provides data the control system uses to protect the compressor. If the sensor is giving inaccurate readings, the system may not respond correctly to abnormal refrigerant conditions, which could lead to compressor stress or damage over time. It is best to have the sensor inspected and corrected promptly.
How much does it cost to repair a Samsung air conditioner showing E237?
If the fix is simply reseating a loose sensor or holder, the cost may only be a service call fee, generally in the range of 75 to 150 dollars depending on your region and technician. If the sensor itself needs replacement, parts and labor combined typically range from 100 to 300 dollars. A refrigerant-related cause, if confirmed, would involve additional diagnosis and potentially higher repair costs.

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