LG Refrigerator IS Error
LG's Er guide lists Er IS among its codes, so the Er family's reset and stop rules on this page come from that guide.
What to check first
- Code read exactly (IS / Er IS / 15)
- One Er reset done (unplug, about 5 minutes, plug back)
- Code cleared and stayed cleared → monitor; returned → stop using, LG service
IS is a temperature sensor fault. LG's list defines it as the ice maker temperature sensor: it detects the temperature of the ice maker and transmits it to the PCB — and LG names this sensor's specific consequence: if the sensor fails, the ice maker may stop working.
Safety first
- Sensors live inside the cabinet, wired to the main board. LG's Er guide warning applies in full: do not disassemble the refrigerator or replace internal parts yourself — fire, electric shock, serious injury, or death.
- Stop condition: stop using the machine and unplug it — and do not run it again until it has been checked — if you smell burning, see smoke, find damaged electrics (a scorched plug, a melted or cut cable), or water is leaking in quantity.
Common causes
The sensor itself is faulty
LG's list defines it as the ice maker temperature sensor: it detects the temperature of the ice maker and transmits it to the PCB — and LG names this sensor's specific consequence: if the sensor fails, the ice maker may stop working. LG's sensor section states the consequence plainly: when a sensor fails, the display shows an error code and the performance of the product is reduced — the board is steering the refrigerator with a broken thermometer.
A faulty component, control circuit, or disconnected wire
The cause family LG's Er guide names for all of its codes, Er IS included: the refrigerator displays the code when it detects an issue with its internal system, such as a faulty component, control circuit, or disconnected wire. Which of the three is the technician's diagnosis, not a guess from the display.
Step-by-step checks
- Note the exact codeRecord the display form (Er IS) and what the affected compartment is doing — the sensor's job is temperature reporting, so its symptom is wrong or drifting temperatures.
- Do the Er family's one resetLG's Er guide procedure: unplug the refrigerator from the wall outlet, wait about 5 minutes, plug it back in, and check whether the error code has cleared.
- Decide by LG's ruleCleared and staying cleared → LG allows the code may have been a temporary power or communication issue. Still showing, or returning → LG's Er guide instruction for a persisting code applies: stop using the refrigerator and contact LG Support for service, because it may indicate a faulty internal circuit or wire.
When to call a technician
Beyond the one Er reset, IS is LG service work — LG's analog list puts it under "please request service" and its Er guide sends a persistent code to LG Support. Quote the exact display form and whether the reset cleared it.
Model differences
| What you have | What changes |
|---|---|
| Segment displays | IS can render as 15 — LG's list illustrates the code with a 15 display photograph. |
| IS vs IF vs It | The ice family: IS = temperature sensor, IF = fan, It = motor. Three parts, three codes. |
One-page checklist — IS
- Code read exactly (IS / Er IS / 15)
- One Er reset done (unplug, about 5 minutes, plug back)
- Code cleared and stayed cleared → monitor; returned → stop using, LG service
Official LG references
Frequently asked questions
Can I keep using the refrigerator with IS showing?
LG's Er FAQ answers for its family: some features may continue to work, but the refrigerator may not control its internal systems correctly — minimize use, and if the code persists, stop using it and contact LG Customer Support.
My display shows 15, not IS. Same code?
Yes — on a seven-segment display the letters render as digits, and LG's digital and analog list illustrates IS with a 15 display photograph. Same sensor, same page.