LG HVAC Error Code 8

Error code 8 on an LG HVAC indoor unit means the fan motor is not rotating or the control board is not detecting rotation. The system shuts down to prevent coil overheating or motor damage. The fault can originate from a seized motor, a wiring issue, a physical obstruction, or a failed control PCB. A voltage check at the motor connector is the primary method for identifying which component has failed.

Yes, continuing to attempt operation with a non-rotating indoor fan can cause the evaporator coil to ice over and place excessive stress on the compressor. The system is designed to shut down specifically to avoid this type of cascading damage. It is best to leave the unit off and have the fault diagnosed promptly rather than repeatedly resetting and restarting.

A power reset may temporarily clear the code and allow the unit to attempt a restart, but if the underlying cause such as a failed motor, damaged board, or obstruction is still present, the error will return quickly. Resetting without diagnosing the root cause can also risk further damage to the PCB if the motor is shorted. The fault should be properly diagnosed and repaired rather than cleared through repeated resets.

Some basic checks are within reach of a careful DIYer, such as confirming the fan blade spins freely by hand and verifying the motor connector is fully seated. However, voltage diagnostics involving 310V DC on the motor wiring should only be performed by someone experienced with high-voltage electrical systems. Replacing the motor or the PCB also requires disassembly of the indoor unit and proper handling of electrical components. If you are not confident working with these voltages, a qualified HVAC technician should handle the repair.

Repair costs vary depending on which component has failed. A simple wiring fix or connector reseating may only involve a service call fee, typically in the range of $75 to $150. An indoor fan motor replacement generally runs $150 to $400 including parts and labor. If the control PCB has also been damaged, costs can increase to $300 to $600 or more depending on the model and parts availability.