LG refrigerators use a linear compressor design that’s efficient when it’s healthy but prone to a specific failure mode: a piston seal that gradually loses pressure, often well before the unit hits five years old. When that happens, both compartments go warm together, not just one side.
This page assumes you’ve already read our full Refrigerator Not Cooling guide, which covers every general cause in diagnostic order. Everything below is specific to LG. It’s part of our full refrigerator troubleshooting hub.
The Three-Symptom Combination to Check For
A failed linear compressor usually shows the same three things together: both the fridge and freezer are warm rather than just one side, you can hear the fans running but no compressor hum from the back-bottom of the unit, and the display may show Er CO, Er IF, Er FF, Er rF, or nothing at all. If all three match, the coils and door gasket aren’t worth checking first.
Check Your Warranty Before Booking a Repair
LG extended the compressor warranty to 10 years on most French Door models built between 2014 and 2021, and that coverage is still being honored. Separately, roughly 1.6 million units made between January 2014 and December 2017 were covered by a class action settlement for premature linear compressor failures. Look up your model and serial number before paying for a compressor replacement out of pocket.
If the Symptoms Don’t Match a Compressor Failure
If only one compartment is warm, or you do hear the compressor running, treat it like any other brand: check the condenser coils and door gasket first before assuming the compressor is at fault. Our full Not Cooling guide covers that diagnostic order.
Frequently Asked Questions
What does the Er CO code mean on an LG fridge?
It signals a communication error between the main control board and the linear compressor's inverter, and in most cases that traces back to a failed compressor.
How do I know if it's the compressor and not something simpler like dirty coils?
Check for all three signs together: both compartments warm, fans running with no compressor hum, and one of the Er codes (or no code at all) on the display. Dirty coils or a bad gasket typically affect one side more than the other and don't come with that symptom combination.
Is my LG compressor still under warranty?
Many French Door models built 2014-2021 carry a 10-year compressor warranty, and units made January 2014 through December 2017 may also be covered under a separate class action settlement. Check your model and serial number before paying for the repair.
Can I replace an LG linear compressor myself?
No. It requires reclaiming refrigerant, which needs certification in most states, on top of specialized tools for this compressor type. This is a licensed technician repair, not a DIY one.
The information provided here is a diagnostic aid and does not replace the intervention of a qualified professional.
