LG Heat Pump Error Code E484

E484 indicates that the LG heat pump detected an instant power-off event, meaning there was a momentary interruption in the electrical supply. The code is designed to flag brief power failures rather than internal component faults. It typically clears on its own once the compressor is running normally. If it appears repeatedly, the electrical supply circuit and wiring connections should be inspected.

If the error appears once and clears with the unit running normally, continued operation is generally acceptable for the short term. However, repeated E484 errors suggest a power supply problem that could stress the compressor and control board over time. Persistent recurrence should be addressed promptly to avoid potential damage to electrical components.

Repair costs depend on the root cause. If the fix involves tightening connections or resetting a tripped breaker, costs are minimal. Replacing a start capacitor typically runs in the range of $80 to $200 including labor. A contactor replacement generally falls between $100 and $250. If a circuit breaker at the main panel needs replacement, expect costs in the $150 to $350 range depending on the breaker type and labor rates in your area.

Yes, in many cases cycling power to the unit at the disconnect or breaker will clear the E484 code since it is triggered by a transient event. However, if the underlying cause is a loose connection, weak breaker, or degraded capacitor, the error is likely to return during the next compressor startup. A reset should be considered a temporary measure if the code keeps reappearing.

Start by checking whether the error clears on its own after the compressor starts. If it keeps returning, inspect all wiring connections at the disconnect and terminal block for looseness or corrosion, and have the circuit breaker tested for proper operation. A qualified technician should also check the start capacitor and contactor for wear. Addressing the root cause in the power supply circuit is the correct fix rather than simply resetting the code.