Samsung Air Conditioner Error Code E310

E310 indicates a discharge temperature sensor error on the fixed capacity compressor 3 in the outdoor unit. The control board has detected a signal voltage either above 4.95V (open circuit) or below 0.5V (short circuit), both of which fall outside the valid sensor range. This error is only triggered when outdoor temperatures are above -10°C to avoid false readings in very cold conditions. The system shuts down or restricts operation to prevent compressor damage.

No, it is not recommended to continue operating the system with E310 active. The discharge sensor is a protective device that guards the compressor against overheating. Without a valid sensor reading, the control board cannot detect a potentially dangerous compressor temperature condition. Continued operation could result in compressor damage, which is a costly repair.

If the fix is simply reseating a disconnected connector, the cost may be limited to a service call fee, typically in the range of $75 to $150. Replacing the discharge temperature sensor itself is generally a lower-cost part repair, often falling in the $100 to $250 range including labor. If the outdoor unit PCB is at fault, parts and labor costs can range from $300 to $600 or more depending on the model and technician rates.

A knowledgeable DIYer can inspect and reseat the sensor connector at the outdoor PCB, which is the first recommended step and requires no special tools. Measuring sensor resistance requires a multimeter and some familiarity with temperature-resistance relationships. Replacing the discharge sensor or PCB involves working inside the outdoor unit and may require handling refrigerant lines, so those steps are best handled by a qualified technician.

A power reset may temporarily clear the error code, but E310 will return if the underlying sensor fault is still present. Because the error is triggered by a measurable out-of-range voltage condition, it will reappear as soon as the unit attempts to operate and reads the invalid sensor signal. The root cause, whether a loose connector, damaged wiring, or failed sensor, must be corrected for the error to stay cleared.