LG Microwave Error Code E-81

E-81 is a control board communication error, meaning the main control board and the display board have lost contact with each other through the internal wiring harness. The microwave cannot operate when this communication link is broken. Diagnosis should start with inspecting the main harness and the display board connector for loose, corroded, or damaged connections.

A power reset by unplugging the microwave for one to two minutes may temporarily clear the code if the communication failure was caused by a transient glitch. However, if the underlying cause is a loose connector, damaged harness, or faulty board, the error will return. A reset alone is not a repair and should be followed by a proper inspection.

Repair costs vary depending on the root cause. If the fix is simply re-seating a connector, there may be no parts cost and minimal labor. Harness replacement typically runs in the range of $20 to $80 for parts. A display board or main control board replacement can cost anywhere from $60 to $200 or more for the part alone, plus labor if a technician performs the work.

In many cases, yes. Start by unplugging the microwave and inspecting the connector between the main harness and the display board. If the connector is loose, re-seating it may resolve the error. If the harness is visibly damaged or the terminals are corroded, a more involved repair is needed. Control board replacement requires comfort working with electronics and is better left to a technician if you are unsure.

No. The E-81 error indicates the control boards cannot communicate, which means the microwave will not operate normally and may not respond to commands correctly. You should not attempt to use the appliance until the fault has been diagnosed and repaired.