LG Refrigerator Error Code R-1-ⓐ

R-1-ⓐ is an ice maker sensor fault code. It means the main PCB has received a temperature reading from the ice maker sensor that is above 149°F (+65°C) or below -58°F (-50°C), which are impossible under normal operation. The code indicates the sensor circuit has a physical or electrical problem such as a disconnection, housing separation, or short circuit rather than an actual extreme temperature condition.

The refrigerator's main cooling function is typically separate from the ice maker circuit, so food stored in the refrigerator and freezer compartments is generally not at immediate risk. However, the ice maker will likely not operate correctly while this fault is present. It is still advisable to address the error promptly to avoid any secondary issues and to restore full ice maker function.

A reset may temporarily clear the code from the display, but if the underlying sensor circuit problem has not been corrected, the error will return. The main PCB continuously monitors the sensor signal, so any persistent wiring fault, bad connector, or failed thermistor will trigger the code again once the refrigerator resumes normal operation. The root cause must be diagnosed and repaired for the error to stay cleared.

Some causes of this error are DIY-friendly. Start by checking that connector CN90 on the main PCB is fully seated, as a loose connector is a common and easy fix. If the connector is secure, inspecting the wiring harness for visible damage is also within reach for a careful DIYer. Replacing the thermistor sensor itself requires basic appliance repair skills and disconnecting power before working on the unit.

If the fix is simply reseating the CN90 connector, there may be no parts cost at all. Replacing a damaged ice maker thermistor sensor typically costs between $15 and $60 for the part depending on the specific model. If a professional technician is needed for diagnosis and repair, total service costs including labor generally range from $100 to $300.