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LG·refrigeratormedium severity
LG Error Code Er rT
Room temperature sensor error
Common Causes
- 1Ambient sensor failure
Step-by-Step Troubleshooting
- 1
Locate the room temperature (ambient) sensor — on LG models it is typically on the main control board or mounted externally near the compressor compartment
- 2
Check if the refrigerator is in an extreme environment (garage below 50F or above 110F) — the ambient sensor may be reading out of expected range
- 3
Measure the sensor resistance and compare to the NTC thermistor chart — at 77F (25C) it should read approximately 10k ohms
- 4
Inspect the sensor wire harness for damage from heat near the compressor or condenser coils
- 5
If the unit is in a garage, LG models without a Garage Ready rating may not compensate properly for temperature extremes
Pro Diagnostic Tip
The ambient sensor controls the condenser fan speed and compressor duty cycle on LG Inverter Linear Compressor models. If it fails high (reads hot), the compressor will run at maximum speed continuously, increasing energy usage by 30-40% before cooling performance visibly degrades.
You Might Also Notice
- •Compressor running at unusually high or low speed
- •Energy bill increased without usage change
- •Unit not maintaining temperature in garage
- •Condenser fan speed not matching room conditions
Parts, Cost & Difficulty
Repair Difficulty
Moderate — Some Experience NeededEstimated Repair Cost
$110–$220
Parts + labor. Free diagnosis with repair.
Parts That May Need Replacement
EBG61285811 (Ambient Thermistor)EBR84433501 (Main Board — if integrated sensor)
Do You Have the Right Tools?
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Frequently Asked Questions
What does LG error code Er rT mean?
LG error code Er rT indicates: Room temperature sensor error. This is a medium-severity issue affecting your refrigerator.
How do I fix LG error code Er rT?
Locate the room temperature (ambient) sensor — on LG models it is typically on the main control board or mounted externally near the compressor compartment Then, Check if the refrigerator is in an extreme environment (garage below 50F or above 110F) — the ambient sensor may be reading out of expected range Then, Measure the sensor resistance and compare to the NTC thermistor chart — at 77F (25C) it should read approximately 10k ohms There are 2 more steps — see the full troubleshooting guide above. This repair typically requires professional tools and expertise.
How do I know if my refrigerator has error Er rT?
Besides the error code on the display, common signs include: Compressor running at unusually high or low speed; Energy bill increased without usage change; Unit not maintaining temperature in garage. If you notice any of these symptoms, check your refrigerator's display panel for error code Er rT.
How much does it cost to fix LG Er rT?
Repair costs for LG Er rT typically range from $110 to $220 depending on the specific cause and parts needed. EasyBear offers free diagnosis when you proceed with the repair. Call (415) 795-7300 for a same-day appointment.