LG Refrigerator Error Code 85

Error code 85 on an LG refrigerator is a compressor low-voltage error. It triggers when the AC input voltage to the compressor inverter drops below 106V, or when the R517 DCLINK resistor on the inverter board is shorted. The refrigerator shuts down the compressor to prevent damage from running under inadequate voltage. Diagnosing the R517 resistor is the recommended first step.

Error code 85 itself is a protective shutdown, meaning the refrigerator has already detected a problem and stopped the compressor to prevent further damage. The underlying cause, particularly low household voltage or a shorted board component, should be addressed promptly. Low voltage conditions can stress other appliances on the same circuit as well. Have a qualified electrician check your home wiring if the outlet voltage is confirmed to be below 106V.

Repair costs vary depending on the root cause. If the issue is low household voltage requiring an electrician, expect to pay somewhere in the range of $100 to $300 or more depending on the scope of the electrical work. Inverter control board replacement, if needed, typically runs between $150 and $400 including parts and labor. If a technician can replace only the R517 resistor as a component-level repair, the cost may be lower, though not all shops offer board-level soldering repairs.

Some causes of error 85 can be addressed without professional help. Checking that the refrigerator is plugged directly into a dedicated outlet and measuring the outlet voltage are safe first steps for a knowledgeable DIYer. However, testing and replacing the R517 resistor or the inverter control board involves working with inverter circuitry and requires appropriate electrical safety knowledge and tools. If you are not comfortable working with control boards, a qualified technician should handle the repair.

A power reset may temporarily clear the error display, but code 85 will return if the underlying cause is not corrected. If R517 remains shorted or the input voltage remains below 106V, the inverter board will detect the fault again and shut the compressor down. A reset should only be used after completing diagnostics and making any necessary repairs to confirm the fault has been resolved.