Samsung Air Conditioner Error Code E306

E306 indicates that the low pressure sensor has been detected as detached or has lost its electrical connection to the control board. The low pressure sensor monitors refrigerant pressure on the suction side of the system. When the board receives no valid signal from this sensor, it shuts down the compressor and displays E306 to protect the system from operating under unknown pressure conditions.

No. The unit will typically prevent the compressor from running when E306 is active, which means attempting to operate it normally will not produce cooling. Even if the unit partially operates, running the compressor without reliable low pressure feedback can lead to compressor damage. The issue should be diagnosed and resolved before returning the unit to regular service.

Repair costs depend on the root cause. If the fix is simply reseating a disconnected wiring harness, you may only pay a diagnostic service call fee, typically in the range of $75 to $150. If the low pressure sensor itself needs replacement, parts and labor combined can range from $150 to $350 or more depending on the unit model and your region. Control board replacement, if required, will be at the higher end of the cost spectrum.

A knowledgeable DIYer can safely inspect the sensor wiring harness and connectors for obvious disconnection or visible damage, and reconnecting a loose plug may resolve the error. However, if the sensor itself needs testing or replacement, or if the refrigerant circuit needs to be evaluated, a certified HVAC technician should handle the work. Accessing internal components of a mini-split or central unit also carries electrical hazards that require appropriate precautions.

A power reset may temporarily clear the error display, but if the underlying cause, such as a disconnected sensor or failed wiring, has not been corrected, the E306 code will return when the unit attempts to operate. Resetting without addressing the root cause is not a fix and should only be done as part of a diagnostic process after inspecting the sensor and its connections.