Written by
Marcus Lindqvist Appliance Care EditorPublished October 26, 2026
VERIFIED
Error codedS (F dS, r dS)
ApplianceRefrigerator
A defrost sensor problem
When the display reads dS, F dS or r dS, the defrost temperature sensor is shorted out or no longer connected. Your model decides the form on screen; LG names no series.
The forms side by side
Display
Sensor involved
dS
General defrost sensor fault
F dS
Freezer defrost sensor
r dS
Refrigerator defrost sensor
Why it matters and what comes next
With a bad sensor, humidity in the air can freeze onto the evaporator and block it. On analog LED panels four LEDs light up, marked -15°C, -17°C, -20°C and -23°C. LG lists no troubleshooting for owners. Someone has to check how each sensor is connected, so book a repair service.
Phone (415) 223-7887 if a dS code stays up on your San Francisco refrigerator. Say which form appears, add the model number, and mention what you did already. Further details: LG refrigerator repair.
Model compatibility: LG reuses codes across series and model years, so dS (F dS, r dS) 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 defrost temperature sensor is shorted or disconnected.
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.
You submit a request with your appliance model and symptom, we confirm an appointment window, and a technician performs an on-site diagnosis. You then receive a clear estimate and decide whether to proceed before any repair begins.
Yes. We provide an upfront estimate after diagnosis. No parts are ordered or installed until you approve the work, so there are no surprise charges.
Replacement parts are selected for the exact model and confirmed with you before ordering or installation.
Service areas are listed on the Locations page. Contact us with your ZIP code to confirm current coverage for your address.
Ready to get your LG appliance working again?
Book a repair online or call us — clear estimates and approval before any repair work begins.
