
If your LG refrigerator is displaying the error code Er rs, you’re not alone — this is a fairly common message that usually points to a problem with a temperature sensor or a defrost-related fault. This guide explains the error in plain American English, shows likely causes, gives safe do-it-yourself checks and fixes, and lists simple preventive steps. The language is easy to read and written to help your blog rank for searches like LG Refrigerator Error Code Er rs, LG fridge Er rs, and Er rs defrost sensor.
Quick overview — what “Er rs” actually is
The Er rs code typically signals that the refrigerator’s temperature sensing system is reporting a fault or that the defrost system isn’t operating correctly. In practical terms, the fridge’s electronics are receiving an unexpected signal from one of the sensors (or no signal at all), so the appliance goes into a protective or error state. Common symptoms include the display showing Er rs, unusual cycling of the compressor, or cooling problems in the freezer or fresh-food compartments.
Common symptoms you might notice
- The fridge shows Er rs on the display.
- Temperatures are too warm or fluctuate unpredictably.
- The freezer has excessive frost buildup.
- The refrigerator runs constantly or won’t cool properly.
What causes Er rs
Several things can trigger this code. Often it’s one of the refrigerator’s sensors (temperature or defrost sensor), but wiring, ice buildup, or a failed defrost heater/timer can also be responsible.
Typical causes include:
- Faulty temperature sensor (bad thermistor).
- Damaged or loose sensor wiring or connector.
- Ice or frost blocking sensors or evaporator area (defrost issue).
- Failed defrost heater, defrost control, or related component.
- Intermittent control board reading due to corrosion or water ingress.
Safe DIY diagnostic steps (do these first)
Before you call a repair pro, try these user-friendly checks. Always unplug the appliance or switch off the breaker before touching internal parts and wait until the freezer is warm enough to work on.
- Turn off power and open the fridge. Locate the temperature sensors — typically small probes in the fresh-food section, freezer, or near the evaporator housing.
- Inspect connectors and wiring for obvious damage or loose plugs. Moisture, pin corrosion, or a disconnected wire often causes errors.
- If there’s heavy frost or ice around the evaporator, thaw the freezer fully (power off and leave the door open) and then power the refrigerator back on to see if the code clears.
- Use a multimeter on the sensor pins to check resistance (ohms). Compare readings to model-specific specs in your owner’s manual. Sensors that are open (OL), shorted (near 0 Ω), or far outside the expected range should be replaced.
- Check the defrost heater and continuity of the defrost circuit if you can access them safely — a broken heater or open circuit can cause persistent frost and sensor errors.
If the Er rs code clears after thawing and inspection, monitor the fridge for 24–48 hours to make sure temperatures stabilize and no new code appears.
How to replace a faulty sensor or defrost part
Replacing a thermistor or defrost component is a common home repair for handy owners. The exact parts and steps depend on your model, but the general flow is similar:
- Order the exact replacement part for your LG model (use the model number on the appliance label).
- Power off the fridge, remove shelving and panels to access the sensor or evaporator area.
- Unplug the sensor connector, remove mounting screws, swap in the new sensor, and reconnect.
- For defrost heaters or thermostats, follow model-specific instructions — these parts can be behind the evaporator cover and may require more disassembly.
- Restore power and check that the error no longer appears and cooling returns to normal.
If you’re uncomfortable with electrical testing or reaching into the evaporator area, it’s safer to contact a technician.
Practical preventative tips to avoid Er rs
Small habits and routine maintenance reduce the chance of sensor and defrost failures:
- Keep door gaskets sealing properly so frost buildup is minimized.
- Don’t overpack the freezer — air must circulate to prevent local freezing that can affect sensors.
- Avoid storing liquids uncovered near sensor probes.
- Inspect the condenser coils every 6–12 months and keep them clean to reduce compressor strain.
- If you have hard water or lots of humidity, periodically check the drain tube and defrost drain for clogs so melting frost can evacuate properly.
- After any service, ensure wiring harnesses are routed so they won’t be pinched or damaged.
Short troubleshooting checklist
- Power-cycle the fridge (turn off, wait, restart).
- Inspect sensor wiring and connectors for damage.
- Defrost the freezer fully and test again.
- Measure sensor resistance; replace if out of spec.
- Check defrost heater and related components if frost is excessive.
Final words
The Er rs error is often fixable at home with a careful inspection, a measured multimeter test, and sometimes a simple sensor replacement. If the problem persists after the DIY steps — especially if the control board shows damage or defrost components are failing repeatedly — a professional diagnosis will ensure the right part is replaced and the repair is done safely.