What IS, 1S (Ice Maker Fan/Sensor) Means
IS (sometimes displayed as 1S, since the digit 1 and letter I look similar on some panels) indicates a problem with the ice maker fan motor or a disconnected ice maker sensor. LG's error-code list and its separate digital-and-analog reference both describe the same ice-maker fault and state there's no troubleshooting available for it.
Common Causes of IS, 1S (Ice Maker Fan/Sensor)
- Ice maker fan motor has failed
- Ice maker sensor has become disconnected
- Ice maker wiring fault
🔧 One Safe Check You Can Try
There's no safe owner step LG documents for this one beyond confirming the ice bin isn't simply jammed with clumped ice, which can occasionally mimic a sensor fault without being one.
⚠ Why You Shouldn't Go Further Than That
- LG states plainly there are no troubleshooting steps for this code - there's no safe intermediate check beyond clearing an obvious ice jam before it needs a technician.
- The ice maker fan and its sensor are mounted inside the freezer assembly with wiring that runs through the door area on many models, which isn't a beginner-friendly repair.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.