LG Heat Pump Error Code E275

E275 indicates a high pressure sensor error caused by a SHORT or OPEN condition in the sensor circuit. The control board expects a signal voltage between 0.4V and 4.2V from the high pressure sensor when the compressor is about to start. A reading below 0.4V triggers a SHORT fault and a reading above 4.2V triggers an OPEN fault, both of which result in the E275 code and prevent compressor operation.

No. The E275 fault prevents the compressor from operating specifically because the system cannot confirm refrigerant pressure conditions are safe. Attempting to bypass or ignore this error and force the unit to run could result in compressor damage from operating under unknown or unsafe high-side pressure. The unit should remain off until the fault is diagnosed and resolved.

A reset may temporarily clear the E275 code, but the error will return as soon as the compressor attempts to start again if the underlying sensor or wiring fault has not been corrected. Resetting without diagnosis is not a fix and can delay identifying a fault that may worsen over time. Always diagnose the root cause before relying on a reset.

Checking the wiring harness and reseating connectors is something a knowledgeable DIYer can do safely with the unit powered off. However, measuring sensor output voltage accurately requires a multimeter and basic electrical knowledge. If the sensor itself needs replacement or the refrigerant circuit needs inspection, a licensed HVAC technician should be involved since working near refrigerant lines carries regulatory and safety requirements.

Repair costs depend on the root cause. A simple wiring repair or connector reseat may only involve a service call fee in the range of $75 to $150. A new high pressure sensor typically costs $30 to $100 for the part, plus labor. If the control board needs replacement, total costs can range from $300 to $600 or more depending on the model and labor rates in your area.