LG Heat Pump Error Code E105

E105 means the indoor unit's evaporator inlet (EVAP IN) temperature sensor has physically separated from the pipe it monitors. This thermistor is clipped directly to the refrigerant pipe at the inlet of the evaporator coil. When it loses contact, the control board detects abnormal readings and triggers E105 to prevent the system from operating on inaccurate data.

It is not advisable to continue running the unit with E105 active. The system is designed to limit or halt operation when this fault is present because the control board is receiving inaccurate evaporator temperature data. Operating under these conditions could lead to coil icing, inefficient performance, or compressor stress over time.

If the fix is simply reattaching the sensor, a service call cost will typically range from around $75 to $150 depending on your location and the technician's rates. If the sensor itself needs to be replaced, parts and labor together could run from $100 to $250 or more. Doing the reattachment yourself, if you are comfortable accessing the indoor unit, costs nothing beyond your time.

In many cases, yes. The repair involves opening the indoor unit, locating the EVAP IN sensor on the evaporator inlet pipe, and firmly reattaching it so it makes good contact with the pipe surface. No refrigerant work is involved. If the sensor clip is broken or the sensor itself is damaged, a replacement part may be needed, at which point a technician familiar with LG systems is recommended.

A simple power reset may temporarily clear the E105 code, but it will return if the sensor is still separated from the pipe. The only reliable way to clear the fault permanently is to physically reseat the sensor against the evaporator inlet pipe and secure it properly before resetting the unit.