LG Refrigerator Error Code Er 5

Er 5 indicates a communication error between the main PCB and the display PCB. The refrigerator monitors the data exchange between these two boards continuously, and if that communication fails for more than 2 minutes, Er 5 is triggered. The issue is most often related to the lead wire connections between the two boards, though a faulty board can also be the cause.

A power reset may temporarily clear the Er 5 code, but if the underlying wiring or board problem has not been corrected, the error will return once the communication failure persists for more than 2 minutes again. A reset is a useful first step to confirm whether the fault is intermittent, but it is not a fix for a hardware problem.

If the fix is simply reseating or replacing the wire harness, costs are relatively low, typically in the range of $20 to $80 for parts and minimal labor. Replacing a display PCB generally runs between $100 and $250 including parts and labor, while a main PCB replacement can range from $150 to $400 or more depending on the model and service provider.

Start by checking the lead wire harness that connects the main PCB to the display PCB. Make sure the connectors are fully seated at both ends and that the wiring is not damaged or pinched. If the connections are secure and undamaged, the next step is testing or replacing the display PCB, followed by the main PCB if the display board is not the issue.

The refrigerator may continue cooling in some cases when Er 5 is active, but without reliable communication between the main board and display, you lose the ability to accurately monitor temperatures or control settings. Food safety can be at risk if the cooling system is also affected. It is best to address the error promptly rather than relying on the unit to operate normally.