Er 5Y
LG
Sensor or PCB Interpretation Error
Error code similar to “5Y” or “SY” and cooling performance is unstable.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Out-of-range thermistor, Intermittent sensor connection, PCB firmware or analog input fault, Electrical noise on sensor lines
How to Fix / Troubleshooting
Safety: Unplug before accessing boards or sensors.
- Power cycle: Unplug for 10 minutes to clear transient faults. If the code returns, continue.
- Check all thermistors: Test refrigerator, freezer, and defrost sensors for proper resistance at known temperatures.
- Inspect harness routing: Ensure sensor wires are not pinched or routed near high-voltage lines that can induce noise.
- Replace suspect parts: Replace any sensor with unstable readings. If all sensors are good, the main PCB may require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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