LG Air Conditioner Error Code E452

E452 indicates a problem with the ZPC detection circuit inside the unit or a momentary power failure that disrupted normal operation. The ZPC circuit is located on the Hub PCB and monitors power supply status for the system. The error causes the unit to stop running until the fault is resolved. It can result from a failing Hub PCB, a damaged connection wire, or an external power interruption.

If E452 was triggered by a momentary power interruption, a reset by powering the unit off and back on may clear the code and restore normal operation. However, if the Hub PCB or Main Hub connection wire is faulty, the error will return after the reset because the underlying hardware problem has not been addressed. Persistent recurrence after resetting is a strong indicator of a component failure that requires inspection.

Repair costs vary depending on whether the issue is the Hub PCB, the connection wire, or simply a power event requiring a reset. Replacing a connection wire is generally less expensive, typically in the range of $50 to $150 including labor. Hub PCB replacement tends to cost more, often in the range of $150 to $400 or higher depending on the model and local labor rates. Getting a diagnostic assessment from a certified technician will provide a more accurate estimate for your specific unit.

Some cases of E452 are caused by brief power outages and can be cleared by resetting the unit after power is restored. However, if the error is caused by a faulty Hub PCB or damaged connection wire, those repairs involve accessing internal electrical components and are best handled by a qualified technician. Attempting internal repairs without proper training can be hazardous and may void any existing warranty.

When E452 is active, the air conditioner typically halts operation as a protective measure, so continued use is generally not possible until the fault is cleared. Attempting to force the unit to operate with an active ZPC circuit fault could risk further damage to the control electronics. It is best to have the unit inspected before returning it to normal service.