LG Air Conditioner Error Code E1

The E1 code on an LG air conditioner indicates a short circuit or open circuit in the indoor pipe thermostat, also known as the indoor pipe temperature thermistor. This sensor monitors the refrigerant pipe temperature inside the indoor unit. When the control board detects an out-of-range resistance reading from this sensor, it triggers the E1 fault and shuts the unit down to prevent damage.

No, you should not attempt to continue operating the unit while the E1 error is active. The indoor pipe thermistor is a protective sensor that prevents the refrigerant circuit from reaching damaging temperature extremes. Running the unit without a functioning pipe thermistor could lead to coil freeze-up or compressor damage. The unit will typically shut down automatically when E1 is triggered.

Repair costs vary depending on the root cause. Replacing the indoor pipe thermistor is generally a lower-cost repair, with parts typically in the range of $15 to $60 and a service call adding labor costs on top of that. If the control board requires replacement, total costs can range from $150 to $400 or more depending on the unit model and local labor rates. A technician can provide a firm estimate after diagnosing the specific fault.

LG directs users to call a qualified technician to resolve the E1 error. While a knowledgeable technician can test the thermistor resistance with a multimeter and inspect the wiring harness for loose or corroded connections, accessing the indoor unit components and safely working with the control board requires proper training and tools. Attempting repairs without that background risks further damage to the unit.

A power reset, such as turning the unit off and back on or cycling the circuit breaker, may temporarily clear the E1 code, but the fault will return if the underlying problem with the thermistor or its wiring has not been repaired. Resetting without fixing the root cause does not make the unit safe to run and may delay a proper diagnosis.