Samsung Air Conditioner Error Code 320

Error code 320 on a Samsung air conditioner indicates an OLP (Over Load Protector) sensor fault, specifically an open circuit or short circuit condition in the sensor or its wiring. The OLP sensor monitors the compressor for excessive current draw or overheating conditions, acting as a safety device to prevent compressor damage. When the control board detects that the signal from the OLP sensor is outside the expected range, either reading as a completely broken circuit (open) or a dead short, it triggers error code 320 and shuts down operation to protect the system.

The most immediate diagnostic step is to inspect the OLP sensor wiring harness for any visible damage, cuts, pinching, or disconnected connectors. A wire cut or broken connector will cause an open circuit reading at the control board. A short circuit can occur when two conductors in the harness make unintended contact, or when moisture or physical damage compromises the sensor itself.

If the wiring appears intact, the OLP sensor component itself may have failed internally, presenting either an open or shorted resistance value outside the acceptable range for the control board. The sensor is typically located on or near the compressor. Testing with a multimeter can confirm whether the sensor resistance is within spec or has failed open or shorted. Replacement of the sensor or wiring harness is generally required if either tests outside acceptable parameters.