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LG Refrigerator Error Code Er IS

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: June 10, 2026
⚠ Medium Severity 🔧🔧 Moderate DIY

Ice maker sensor failure

The most common cause of the Er IS error on a LG refrigerator is sensor open circuit (~65% of cases); start with: defrost ice maker area.

💰 DIY cost: $15–$40 👨‍🔧 Pro cost: $150–$300 Save $135+ by doing it yourself
LG Refrigerator error code Er IS on the display panel
How the Er IS code appears on a LG refrigerator display

What Does Error Code Er IS Mean on a LG Refrigerator?

Ice maker sensor failure.

The control board monitors the ice maker's thermistor to confirm the tray has chilled enough to trigger a harvest cycle. Er IS fires when that circuit reads open or shorted—an out-of-range resistance the board treats as a sensor fault. Ice production then slows or halts because the board can't verify tray temperature. Unlike Er IF (fan) or Er FF (freezer/defrost) codes, Er IS points specifically to the ice maker temperature sensor or its wiring, sometimes masked by heavy frost sitting over the sensor.

Models affected: LG refrigerators with a built-in ice maker, including models such as the LFXS26973S, LFXS28968S, LRFVS3006S, LMXS28626S, and LRFDS3016S, as well as similar French-door and side-by-side units.
What owners report: Owners commonly report this code appearing alongside little or no ice, often after a period of poor cooling or frost buildup around the ice maker. A quick win many describe is fully thawing the ice maker area first, since frost over the sensor can trigger a false reading that clears once defrosted.

What Causes Error Code Er IS?

Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:

  1. 1
    Sensor open circuit 65% of cases
  2. 2
    Frost covering sensor 25% of cases
  3. 3
    Connector loose 10% of cases

How to Fix LG Refrigerator Error Code Er IS

🔧🔧 Moderate DIY Est. time: 30–60 min
⚡ Safety first: Unplug the appliance before opening any panels or touching internal components.
  1. 1

    Defrost ice maker area

    Fully thaw before diagnosing.

  2. 2

    Test and replace sensor

    Check resistance, replace if out of spec.

    🔩 LG ice maker sensor ($15–$40)

How to Reset Error Code Er IS

Press ice maker reset after repair.

Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.

Full LG refrigerator reset guide → Enter diagnostic mode →

Did this guide fix your appliance?

When to Call a Professional

If sensor replaced and error persists, ice maker control circuit failed.

Average professional repair cost for this issue: $150–$300

Related Error Codes

Er IF
Ice maker fan error
⚠ Medium Severity
Er FF
Freezer fan error — fan motor not operating
⚠ High Severity

Find Replacement Parts

Use these links to find the exact replacement parts for your LG Refrigerator:

🔩
Search PartSelect
LG Refrigerator repair parts
🔧
Search RepairClinic
Step-by-step video guides

External links — ApplianceErrors.com is not affiliated with these retailers.

More LG Refrigerator Error Codes

Er dH Defrost heater error — defrost cycle not completing Er CF Condenser fan motor error Er FS Freezer temperature sensor error Er CO Communication error — main board to sub-board dS Defrost sensor open circuit Er rS Refrigerator (fresh-food) compartment sensor error

Frequently Asked Questions

Can I keep using my LG Refrigerator when error Er IS appears? +
You often can for a cycle or two, but the sensor issue behind Er IS will keep interrupting normal operation until it is fixed. Plan the repair rather than ignoring the code.
What most commonly causes Er IS on a LG Refrigerator? +
Across reported LG refrigerator repairs, the most frequent is sensor open circuit (65% of cases), frost covering sensor (25%), then connector loose (10%). Check them in that order before replacing any parts.
Er IS keeps coming back after a reset — what should I check next? +
A reset only clears the stored Er IS fault; if it returns, the sensor problem is still present. Move on to the physical checks — defrost ice maker area, then test and replace sensor — since the code will reappear until the root cause is resolved. This is a moderate job — a multimeter and some disassembly are usually involved.
How much does it cost to fix LG Refrigerator error Er IS? +
A DIY repair typically runs $15–$40 in parts, versus $150–$300 for a professional service call, so handling it yourself saves around $135. Expect the work to take roughly 30–60 minutes.
Which LG Refrigerator models show error Er IS? +
Er IS is documented on LG refrigerators with a built-in ice maker, including models such as the LFXS26973S, LFXS28968S, LRFVS3006S, LMXS28626S, and LRFDS3016S, as well as similar French-door and side-by-side units.. Other units sharing the same control platform can display it too, so the fixes here generally transfer across the series.

Sources & References

Content verified against manufacturer service documentation. Last verified: June 10, 2026.

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