Samsung Air Conditioner Error Code E235

E235 indicates that the control board has detected a breakaway, or open circuit, condition at the compressor sump temperature sensor on the digital compressor or fixed compressor 1. This sensor monitors oil temperature at the base of the compressor to protect internal components. The system generates this fault when it loses the sensor signal entirely, which points to a disconnected connector, broken wire, or failed sensor.

No, you should not continue running the unit with E235 active. The compressor sump temperature sensor is a protective component, and without a valid signal, the system cannot monitor oil temperature or prevent compressor overheating. Operating the unit in this condition risks serious compressor damage, which is a costly repair.

A power reset will temporarily clear the displayed error code, but E235 will return as soon as the control board re-checks the sensor circuit and detects the open condition again. The fault must be resolved at the hardware level by reconnecting or replacing the faulty sensor or wiring before the error will stay cleared permanently.

If the cause is simply a loose or disconnected sensor connector, a knowledgeable DIYer can locate the sump temperature sensor on the outdoor unit compressor, reseat the connector, and clear the error. However, if the sensor or wiring harness needs to be replaced, or if the outdoor unit must be partially disassembled to access the sensor, professional service is recommended. Working inside an outdoor refrigeration unit also requires caution around high-voltage components.

If the fix is only a reseated connector, there may be no parts cost, and a service call fee is typically in the range of $75 to $150. If the sump temperature sensor itself needs replacement, parts and labor combined generally range from $150 to $400 depending on the unit model and local labor rates. A control board replacement, if required, can push costs significantly higher.