ER RS

Refrigerator Compartment Sensor Error

Home Appliance Error Codes LG Refrigerators

Can you still use it? With care until repaired

Who can fix it? Needs a technician

Typical repair time 30 minutes – 1.5 hours

Typical cost SAR 100 to 1,500

What it means

This code appears on LG refrigerators with a digital display and means the main board is reading an impossible value from the temperature sensor (thermistor) in the fresh food compartment, usually because the sensor or its connection is open or shorted. The refrigerator may keep cooling on an estimated basis, but the fresh food section can end up colder or warmer than set; the same code can mean something else on other brands.

Models covered: LG refrigerators with a digital display (e.g. side-by-side, French door and top-freezer models); the code shows as Er plus two letters.

Symptoms4

Er rS shows on the refrigerator display.
The fresh food section is warmer than usual, or food freezes in it.
Changing the temperature on the display has little effect.
The compressor may run at irregular intervals.

Possible causes5

Loose or corroded sensor connector from moisture.
Failed fresh food compartment sensor, open or shorted.
Broken or pinched sensor wire inside the wall or at the hinge.
Water or condensation reaching the sensor area.
A fault in the sensor input circuit on the main board.

How to diagnose5

Unplug the refrigerator for a few minutes and plug it back in; if the code returns, the fault is real.
Put a thermometer in the fresh food section to watch the real temperature until the repair.
Keep the doors closed as much as possible and do not block the air vents with food.
A technician unplugs the refrigerator before opening any cover, then measures the sensor resistance against the LG temperature-resistance table.
The technician checks the connector and wiring; if they and the sensor are good, the main board is at fault.

How to fix5

Clean and reseat the sensor connector.
Repair a broken or pinched sensor wire.
Replace the fresh food compartment sensor with the correct part for the model.
Replace the main board only after the sensor and wiring are confirmed good.
Run the refrigerator and check with a thermometer that the temperature is steady without the code returning.

Repair cost

0–200

200–600

600–1,500

1,500+

In Saudi riyals; the highlighted part is the expected range for this fault.

Most cases are solved with a new sensor or a connector repair at low cost; the price rises only if the main board must be replaced.

Prices are rough estimates including the part and the technician’s fee, and vary with brand, model and part source.
Prices last updated: September 2026

Frequently asked questions

Does the refrigerator keep cooling with this code?

Usually yes, on an estimated basis, but the temperature may not be controlled. Put a thermometer inside and watch the food until it is repaired.

Is the sensor an expensive part?

No. A temperature sensor is a cheap part and quick for a technician to fit; the cost is higher only if the main board is at fault.

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This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.

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