LG Refrigerator Error Code HUMIDITY-Sensor Error

The HUMIDITY-Sensor Error means the main control board has detected a problem with the humidity sensor circuit. The sensor signal voltage, measured at PCB connectors CN30-7 to CN50-7, is outside the expected range of 1.0V to 3.5V. This can be caused by a failed sensor, damaged wiring, or in less common cases, a faulty main PCB.

The refrigerator may continue to cool while this error is present, but humidity-related functions may not operate correctly, which could affect food preservation quality over time. It is advisable to have the issue diagnosed promptly to prevent any secondary problems from developing.

A reset may temporarily clear the error code, but if the underlying fault in the sensor, wiring, or PCB is still present, the code will return. A reset should only be used after the root cause has been identified and repaired to confirm the fault has been resolved.

Start by checking the voltage at main PCB connector CN30-7 relative to CN50-7 using a multimeter. The reading should be between 1.0V and 3.5V. If the voltage is out of range, inspect the sensor wiring harness and connector pins for damage or corrosion before testing or replacing the humidity sensor itself.

Repair costs vary depending on the failed component. A replacement humidity sensor typically costs in the range of $20 to $60 for the part alone, while main PCB replacement can range from $100 to $300 or more. Adding professional labor will increase the total, generally ranging from $150 to $400 depending on the diagnosis and parts required.