Written by
Marcus Lindqvist Appliance Care EditorPublished October 26, 2026
VERIFIED
Error codeIS (1S)
ApplianceRefrigerator
Read it as 1S or as IS: the code names the temperature sensor of the ice maker. One LG guide frames it as a problem with the ice maker fan motor or as an unplugged ice maker sensor. A visible result can be an ice maker that quits, leaving no cubes landing in the bucket.
No home fix
According to LG, owners cannot resolve this one themselves. Arrange a repair service.
Compare with these
A fan fault in the same area appears as IF, a motor fault as It, and a different sensor, the humidity one, as HS.
San Francisco LG refrigerator ice maker repair
For IS on an LG refrigerator in San Francisco or the Bay Area, call (415) 223-7887. Note whether cubes still reach the bucket, and keep the model number nearby. LG refrigerator repair has more detail.
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
The ice maker temperature sensor has a fault, and the ice maker may stop.
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.
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Replacement parts are selected for the exact model and confirmed with you before ordering or installation.
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