LG Heat Pump Error Code E272

E272 indicates an open or short circuit fault on the SUMP TEMP FIXED 1 sensor, which monitors oil temperature in the compressor sump. The control board detects this when the sensor voltage reads above 4.95V or below 0.5V, corresponding to temperatures outside the range of -30°C to 151°C. The system shuts down to protect the compressor from running without reliable temperature monitoring. This fault is only active when outdoor temperatures are above -10°C.

No. The E272 error causes the system to shut down because the compressor oil temperature can no longer be reliably monitored. Running the system without this protection risks compressor damage from overheating or lubrication issues. The unit should remain off until the sensor fault is diagnosed and corrected.

Repair costs vary depending on what component has failed. Connector cleaning or reseating may cost little beyond a service call fee, typically in the range of $75 to $150. Replacing the oil temperature sensor generally adds $50 to $200 in parts depending on availability. If the control board requires replacement, total costs including labor can range from $400 to $900 or more.

Some basic checks, such as inspecting and reseating the sensor connector, can be done by a knowledgeable homeowner. However, accurately measuring sensor resistance and checking wiring harness continuity requires a multimeter and some familiarity with electrical diagnosis. Replacing the sensor or control board involves working inside the outdoor unit and is best handled by a qualified technician.

A power reset may temporarily clear the error code, but if the underlying sensor, wiring, or connector fault is still present, the code will return once the system restarts and the outdoor temperature is above -10°C. Clearing the code without fixing the root cause does not resolve the problem and can allow repeated shutdown cycles.