LG Heat Pump Error Code E280

E280 on an LG heat pump signals a main cooling solenoid valve open error. This means the control board has detected that the solenoid valve managing refrigerant flow during cooling is either not responding or showing an open circuit condition. The system will typically disable cooling operation to protect the compressor and refrigerant circuit until the fault is resolved.

It is not advisable to continue operating the unit with an active E280 error. The fault indicates that the cooling solenoid valve is not functioning correctly, which can lead to improper refrigerant pressures and potential compressor damage if the system continues to run. Power down the unit and arrange for a technician to inspect it promptly.

A power reset may temporarily clear the E280 error code, but it will return if the underlying fault is still present. Because the error reflects a real electrical or mechanical condition in the solenoid valve circuit, a reset alone is not a repair. The root cause must be identified and corrected before the system will operate reliably without returning the fault.

Some causes of E280, such as a loose connector or a disconnected wire, can be addressed by a knowledgeable DIYer comfortable working with electrical components. However, diagnosing solenoid valve coil resistance, verifying control board voltage output, or replacing refrigerant-side components requires proper tools and expertise. Any work involving the refrigerant circuit must be performed by a certified HVAC technician.

Repair costs depend on the root cause. Wiring repairs or connector cleaning may cost relatively little, typically in the range of $75 to $200 for a service call and labor. Replacing a solenoid valve coil or the full valve assembly can range from $150 to $450 or more depending on parts and labor. A control board replacement tends to be the most expensive scenario, often ranging from $300 to $700 or higher.