Step-by-Step DIY Fix Guide
- SAFETY: Unplug the refrigerator.
- Reset by unplugging for 5 minutes, then restore power and check if rS clears.
- If rS returns, call an LG-authorized technician to test and replace the refrigerator section sensor.
If the warning comes back after restart
- If the warning returns immediately after a clean restart, the sensor or wiring path becomes more likely than a one-time glitch.
- rS persists after a 5-minute power reset
What This Error Means
Error rS on your LG refrigerator means: The fresh food compartment temperature sensor (thermistor) has shorted or become disconnected. The control board cannot accurately monitor refrigerator temperature and may not cool the section correctly. The refrigerator's self-diagnostic system has detected this condition.
The most frequent cause is refrigerator section thermistor failure. Work through the causes and fix steps below in order — many LG refrigerator errors are resolved without a service call.
LG's official guidance classifies rS as a technician-only fault. A 5-minute power reset is the only DIY step — if the code returns, contact LG Support at 1-800-243-0000.
Sensor faults require professional diagnosis. A 5-minute power reset resolves transient communication glitches. If the code returns after a reset, the sensor or its wiring has physically failed and will not recover without replacement.
Most Likely Cause by Symptom
The LG refrigerator may stop, pause, or refuse to complete the cycle normally.
Likely cause: Refrigerator section thermistor failure
Check first: SAFETY: Unplug the refrigerator.
The warning may return immediately because the appliance is detecting an internal fault.
Likely cause: Wiring harness connector to the sensor is loose or corroded
Check first: Reset by unplugging for 5 minutes, then restore power and check if rS clears.
Common Causes
- Refrigerator section thermistor failure
- Wiring harness connector to the sensor is loose or corroded
- Sensor physically displaced during shelf cleaning or food storage
What Not to Do
- Do not continue using the refrigerator with rS for extended periods — unregulated temperatures can allow food to warm above 40°F without warning
Model and Display Variation Notes
Model-family notes
- LG refrigerator display wording and code formats can vary by series.
- If your model behaves differently, check the owner manual before trying any deeper maintenance step.
Display and panel differences
- Panel wording can vary by series, so confirm the exact code pattern before buying parts.
Parts, Tools and Service Options
Service option
LG service visit if the warning returns after the basic checks are complete.
Manual and model check
Check your exact model and manual before ordering any LG refrigerator parts.
Common parts
- Refrigerator thermistor/temperature sensor if sensor has failed ($15–$40)
This section stays service-first because the page points more strongly toward support or professional repair than a routine parts purchase.
When Not to Keep Troubleshooting
rS persists after a 5-minute power reset
How to Prevent It Recurring
- Avoid pushing food items directly against the back wall of the refrigerator — sensors are often mounted there and can be damaged by heavy containers
Related Error Codes
FS
The freezer temperature sensor (thermistor) has shorted or become disconnected. The control board cannot monitor freezer temperature and cannot regulate the cooling cycle correctly.
dS
The defrost sensor (thermistor that monitors evaporator temperature during the defrost cycle) has either shorted or become disconnected. Without a valid sensor reading, the control board cannot safely manage the defrost cycle.
rF
LG refrigerator error rF usually means the refrigerator-section fan is not moving air correctly.
Extra notes
- This page is based on LG support material and stays conservative where model-specific guidance may vary.
- The goal is to help you identify safe first checks before you move into parts, service, or model-specific manual lookup.
Source and model notes
Last reviewed: 2026-04-08
Based on: Based on LG support material and edited into consumer-safe guidance for the exact code family on this page.
Model coverage note: LG refrigerator code meanings can vary by series, control panel, and model family, so use this page as a safe starting point rather than a replacement for the model-specific manual.
Important: FixThisError is an independent guide, not the manufacturer. Use your model-specific manual when the panel wording or behavior differs.
Always disconnect power before inspecting appliances. If unsure, contact a licensed appliance technician.