LG Air Conditioner Error Code E396

E396 indicates a DC voltage sensor error on the outdoor Fan2 PCB. The system has detected that the DC-Link voltage signal from the Fan2 circuit board is abnormal or missing. This causes the unit to stop outdoor fan operation to protect components from running under incorrect electrical conditions. A technician should check the Inverter PCB, the Fan2 PCB, and the wiring connecting them.

No, you should not attempt to operate the unit while E396 is active. The error indicates the fan drive circuit is not functioning correctly, and running the system in this state could cause additional damage to the Inverter PCB, Fan PCB, or the fan motor itself. Leave the unit off until the fault is diagnosed and repaired.

Repair costs vary depending on what component has failed. If only a loose wire or connector needs to be reseated, the cost may be limited to a diagnostic service call, typically in the range of $75 to $150. If the Fan2 PCB or Inverter PCB needs replacement, parts and labor combined can range from $250 to $800 or more depending on the unit model and local labor rates.

Basic checks such as verifying the outdoor unit is receiving full power and inspecting for any obviously disconnected wiring can be done by a knowledgeable homeowner. However, working inside the outdoor unit involves high-voltage DC circuits that retain a dangerous charge even after power is disconnected. Component-level diagnosis and board replacement should be performed by a qualified HVAC technician.

A power reset may temporarily clear the error code, but if the underlying wiring or board fault is still present, the code will return once the system attempts to operate the outdoor fan. A reset is useful for confirming whether the fault is intermittent, but it does not fix the root cause. A proper diagnosis of the DC-Link voltage wiring and PCBs is still required.