LG Er rt

LG error code ER RT indicates: On LG Refrigerator: Room temperature sensor failure (ambient temperature detection problem) / ABNORMAL AMBIENT SENSOR.

The primary root cause for LG code ER RT is: On LG Refrigerator: Room temperature sensor disconnection or short circuit. Ambient Sensor short&open circuit..

To resolve error code ER RT: On LG Refrigerator: Unplug the appliance and wait for 20 seconds, then restart. Check if the connector at the PCB or at the hinge is removed or loose, then re-insert. Check if the connector measures out of 5 ~ 400 kilo-ohm range (normal is 13 kilo-ohm at 20 degrees Celsius). Replace the assemblies if the problem is not solved.

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if LG code ER RT persists, the physical component causing On LG Refrigerator: Room temperature sensor disconnection or short circuit. Ambient Sensor short&open circuit. must be inspected or replaced.

Set a digital multimeter to ohms (Ω). Disconnect power and test NTC Temperature Sensor Probe (Thermistor) across Across sensor pins 1-2 (unplugged harness). Expected nominal reading is 4.8kΩ–12kΩ (at 20°C–25°C). Tolerance: Negative temperature coefficient: resistance drops smoothly when warmed with fingers. OL = open circuit..

Standard electrical safety protocol: 1. Disconnect 230V mains power before opening panels. 2. Verify zero voltage at test points. 3. Allow hot water or heating elements to cool below 30°C before handling.