LG Refrigerator Error Code 87E

The 87E code on an LG refrigerator indicates a compressor over voltage error. The inverter control board has detected that the voltage at the compressor circuit is outside the acceptable range. This triggers a protective shutdown to prevent compressor damage. The first diagnostic step is to check the resistance of sensing resistors R501, R505, and R509 on the inverter board for short or open failures.

The 87E error indicates the compressor circuit is experiencing an over voltage condition, which means the compressor may not be running properly. The refrigerator will likely not maintain safe food storage temperatures while this fault is active. It is best to address the error promptly and transfer perishable food to another refrigerator until the repair is complete.

Unplugging the refrigerator for a few minutes may temporarily clear the 87E code, but if the underlying cause has not been repaired, the error will return once the compressor attempts to run again. A reset should only be used as part of the diagnostic process, not as a long-term fix. The sensing resistors and incoming voltage must be properly evaluated and any faulty components replaced to resolve the fault permanently.

Diagnosing this error requires a multimeter and some comfort working with electronic components on the inverter board. A knowledgeable DIYer can test the sensing resistors R501, R505, and R509 for short or open conditions, and check the line voltage at the outlet. Replacing individual resistors or the full inverter board is possible for those with soldering skills or board-swap experience, but if you are not comfortable with live electrical components, a qualified technician is recommended.

Repair costs depend on the root cause. If only resistors on the inverter board need replacement, the parts cost is minimal, though a technician's labor fee will apply. If the full inverter control board requires replacement, parts and labor typically range from $150 to $400 or more depending on the model and service provider. Checking line voltage and wiring connections costs nothing beyond a service call fee if those turn out to be the issue.