LG rt

LG error code RT indicates: Room temperature sensor problem / Ambient temperature detection problem / Failure of Outside Sensor (displayed as 'Er' on the outside temperature display part)..

The primary root cause for LG code RT is: A room temperature sensor disconnection or short circuit / Snapping or short-circuit of outside temperature perceiving sensor..

To resolve error code RT: 1. Unplug the appliance and wait for 20 seconds. 2. Restart the appliance. Repair Instructions: Check if the connector at the PCB or at the hinge is removed or loose (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 RT persists, the physical component causing A room temperature sensor disconnection or short circuit / Snapping or short-circuit of outside temperature perceiving sensor. 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.