Written by
Maya Chen Editorial TeamPublished September 5, 2026Updated October 20, 2026
Error codeIS (1S)
ApplianceRefrigerator
Quick answer
IS on an LG refrigerator is an ice maker temperature sensor fault, also written 1S.
Model compatibility: LG reuses codes across series and model years, so IS (1S) may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
Ice maker temperature sensor fault.
IS, sometimes read as 1S, is an ice maker temperature sensor fault on an LG refrigerator. One LG guide describes it as a problem with the ice maker fan motor or a disconnected ice maker sensor. The ice maker may stop, because ice cubes are no longer dispensed into the ice bucket.
Troubleshooting
LG says that nothing can be done at home for this code. The refrigerator needs a repair service.
An LG refrigerator showing IS in Los Angeles can be booked in at (310) 742-8008. Read out the code and the model number, and say what you tried first. See also LG refrigerator repair.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your LG appliance?
Book a specialist visit for a clear estimate and approval before any repair.
