LG Heat Pump Error Code E305

E305 means the outdoor unit's condenser midpoint (COND MID) temperature sensor has separated or become detached from its mounting position on the condenser coil. The control board uses this sensor to monitor coil temperatures during operation. Without a reliable reading from this sensor, the system triggers the fault code and stops normal operation to prevent potential damage.

No, you should not attempt to operate the heat pump while E305 is active. The error code causes the system to stop normal operation specifically because the control board cannot reliably monitor condenser coil temperatures. Running the unit without this sensor data could lead to improper defrost cycling or refrigerant issues.

If the sensor only needs to be repositioned and clipped back into place, the cost may be limited to a service call fee, typically in the range of $75 to $150. If the sensor or wiring harness needs replacement, parts and labor combined could range from $150 to $350 or more depending on your location and the specific components required.

If the sensor has simply come loose from its clip on the outdoor condenser coil, a homeowner comfortable working around outdoor HVAC equipment may be able to reattach it after powering down the unit. However, if the mounting clip is broken, the wiring is damaged, or the sensor itself has failed, a qualified technician should handle the repair to ensure the component is correctly reinstalled and the system operates safely.

A power reset may temporarily clear the fault display, but E305 will return if the underlying issue has not been corrected. The sensor must be physically reattached to the condenser coil and confirmed secure, or repaired if damaged, before a reset will result in normal sustained operation.