LG Air Conditioner Error Code 87

Error code 87 on an LG air conditioner indicates a Fan PCB EEPROM checksum error. This means the memory chip on the fan circuit board failed its data integrity check during startup. The system cannot confirm the stored configuration data is valid, so it halts operation and displays this code. A technician will need to inspect the EEPROM chip and its connections, or replace the fan PCB assembly.

A simple power reset is unlikely to permanently clear error code 87 because the fault is tied to a checksum verification that runs every time the unit initializes. If the EEPROM chip is incorrectly seated or its data is corrupted, the error will return on the next startup. The underlying physical or data issue must be corrected before the code will clear reliably.

If the fix is simply reseating or correcting the orientation of the EEPROM chip, a service call fee is likely the main cost, generally in the range of $75 to $150 depending on your location. If the fan PCB assembly needs to be replaced, parts and labor combined can range from $200 to $500 or more depending on the specific unit model and local labor rates. Getting a diagnostic estimate before authorizing repairs is advisable.

A knowledgeable DIYer can start by powering the unit off completely and checking whether the EEPROM chip on the fan PCB is seated correctly and oriented in the right direction. However, if the chip connections look fine and the error persists, the fan PCB assembly will likely need to be replaced, which involves working with internal control board components. At that point, a qualified technician is the safer option.

Error code 87 typically prevents normal operation because the fan PCB cannot confirm valid configuration data at startup. Attempting to force operation without resolving this fault is not recommended, as the system may not function correctly or safely. The unit should remain off until the EEPROM issue is diagnosed and corrected.