LG Heat Pump Error Code 41

Error code 41 indicates that the inverter compressor discharge pipe sensor has been detected as either open or shorted by the control PCB. The discharge pipe sensor is a thermistor that monitors refrigerant temperature leaving the compressor. When its signal falls outside the acceptable range, the system shuts down to protect the compressor. The fault points to either the sensor itself, its wiring, or the connector at the PCB.

No, you should not attempt to bypass or ignore error code 41. The discharge pipe sensor is a critical protection device for the compressor, and operating without a valid temperature reading risks compressor overheating and serious internal damage. The system is designed to shut down when this fault is detected, and that shutdown should be respected until the fault is resolved.

A power reset may temporarily clear the fault code and allow the system to restart, but if the underlying problem with the sensor, wiring, or connector is not resolved, the error will return. Repeatedly resetting the unit without fixing the root cause can expose the compressor to unmonitored high discharge temperatures. The fault should be properly diagnosed and repaired before returning the unit to normal operation.

A knowledgeable DIYer can inspect and reseat the sensor connector at the PCB without specialized tools. If the connector is secure, testing the sensor resistance and wiring requires a multimeter and some familiarity with thermistor behavior. However, if the sensor or PCB needs replacement, working on a heat pump refrigerant circuit or control board is best handled by a qualified technician.

If only the sensor connector needs reseating, there may be no parts cost at all, though a service call fee typically applies. Replacing the discharge pipe sensor itself generally costs in the range of $75 to $200 for parts and labor combined. If the wiring harness or control PCB requires replacement, costs can rise to the range of $200 to $600 or more depending on parts availability and labor rates in your area.